diff --git a/src/CncCollector/Core/CollectorEngine.cs b/src/CncCollector/Core/CollectorEngine.cs
index fbf3027..d936fd2 100644
--- a/src/CncCollector/Core/CollectorEngine.cs
+++ b/src/CncCollector/Core/CollectorEngine.cs
@@ -30,6 +30,7 @@ namespace CncCollector.Core
         private Timer _dailySummaryTimer;
         private Timer _logCleanupTimer;
         private LogCleanupJob _logCleanupJob;
+        private LogArchiveJob _logArchiveJob;
         private DateTime _startTime;
         private long _totalSuccess;
         private long _totalFail;
@@ -59,6 +60,8 @@ namespace CncCollector.Core
             _dailySummary = new DailySummaryJob(config.BusinessConnection);
             // 初始化分析引擎（与业务库和日志库同源，后续按需调整）
             _analysisEngine = new AnalysisEngine(config.BusinessConnection, config.LogConnection);
+            // 初始化日志归档任务（保留30天）
+            _logArchiveJob = new LogArchiveJob(30);
         }
 
         /// <summary>
@@ -337,6 +340,8 @@ namespace CncCollector.Core
                     {
                         _lastSummaryDate = summaryDate;
                         _dailySummary.Execute(summaryDate);
+                        // 同步执行日志归档：把前一天的日志移到日期子目录
+                        _logArchiveJob.Execute();
                     }
                 }
             }
diff --git a/src/CncCollector/Jobs/LogArchiveJob.cs b/src/CncCollector/Jobs/LogArchiveJob.cs
new file mode 100644
index 0000000..3ed10e0
--- /dev/null
+++ b/src/CncCollector/Jobs/LogArchiveJob.cs
@@ -0,0 +1,151 @@
+using System;
+using System.IO;
+using log4net;
+
+namespace CncCollector.Jobs
+{
+    /// <summary>
+    /// 日志文件归档任务。
+    /// 每天凌晨将前一天的日志文件移动到按日期命名的子目录中。
+    /// 目录结构示例：
+    ///   logs\collector.log          ← 当前在写的运行日志
+    ///   logs\collector_error.log    ← 当前在写的错误日志
+    ///   logs\2026-05-07\collector.log
+    ///   logs\2026-05-07\collector_error.log
+    ///   logs\2026-05-06\collector.log
+    ///   logs\2026-05-06\collector_error.log
+    /// 保留天数外的旧目录自动清理。
+    /// </summary>
+    public class LogArchiveJob
+    {
+        private static readonly ILog _log = LogManager.GetLogger(typeof(LogArchiveJob));
+
+        /// <summary>
+        /// 日志保留天数
+        /// </summary>
+        private readonly int _retainDays;
+
+        /// <summary>
+        /// 日志根目录（相对于BaseDirectory）
+        /// </summary>
+        private readonly string _logsDir;
+
+        public LogArchiveJob(int retainDays = 30)
+        {
+            _retainDays = retainDays;
+            _logsDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "logs");
+        }
+
+        /// <summary>
+        /// 执行归档：把当前日志文件复制到昨天的日期目录，然后截断当前文件。
+        /// 应在每天凌晨00:00左右调用。
+        /// </summary>
+        public void Execute()
+        {
+            try
+            {
+                if (!Directory.Exists(_logsDir))
+                {
+                    return;
+                }
+
+                var yesterday = DateTime.Now.AddDays(-1).ToString("yyyy-MM-dd");
+                var archiveDir = Path.Combine(_logsDir, yesterday);
+
+                // 归档每个日志文件
+                ArchiveLogFile("collector.log", archiveDir);
+                ArchiveLogFile("collector_error.log", archiveDir);
+
+                // 清理过期目录
+                CleanupOldDirectories();
+
+                _log.Info($"日志归档完成（{yesterday}）");
+            }
+            catch (Exception ex)
+            {
+                _log.Error("日志归档失败", ex);
+            }
+        }
+
+        /// <summary>
+        /// 归档单个日志文件到日期目录
+        /// </summary>
+        private void ArchiveLogFile(string fileName, string archiveDir)
+        {
+            var sourceFile = Path.Combine(_logsDir, fileName);
+            if (!File.Exists(sourceFile))
+            {
+                return;
+            }
+
+            var fileInfo = new FileInfo(sourceFile);
+
+            // 文件为空或太新（最后写入在1小时内）则跳过
+            // 避免归档正在活跃写入的当天日志
+            if (fileInfo.Length == 0)
+            {
+                return;
+            }
+
+            // 创建日期目录
+            if (!Directory.Exists(archiveDir))
+            {
+                Directory.CreateDirectory(archiveDir);
+            }
+
+            var destFile = Path.Combine(archiveDir, fileName);
+
+            // 如果目标已存在，追加序号
+            if (File.Exists(destFile))
+            {
+                var seq = 1;
+                var baseName = Path.GetFileNameWithoutExtension(fileName);
+                var ext = Path.GetExtension(fileName);
+                do
+                {
+                    destFile = Path.Combine(archiveDir, $"{baseName}_{seq}{ext}");
+                    seq++;
+                } while (File.Exists(destFile));
+            }
+
+            // 复制到日期目录（不是移动，因为log4net还持有文件句柄）
+            File.Copy(sourceFile, destFile);
+
+            // 截断当前日志文件（清空内容，但不删除文件，保持log4net文件句柄有效）
+            File.WriteAllText(sourceFile, string.Empty);
+
+            _log.Info($"已归档 {fileName} → {archiveDir}（{fileInfo.Length} 字节）");
+        }
+
+        /// <summary>
+        /// 清理超过保留天数的日期目录
+        /// </summary>
+        private void CleanupOldDirectories()
+        {
+            if (!Directory.Exists(_logsDir))
+            {
+                return;
+            }
+
+            var cutoff = DateTime.Now.AddDays(-_retainDays).ToString("yyyy-MM-dd");
+
+            foreach (var dir in Directory.GetDirectories(_logsDir))
+            {
+                var dirName = Path.GetFileName(dir);
+                // 日期目录格式：yyyy-MM-dd
+                if (dirName.Length == 10 && dirName.Contains("-") && dirName.CompareTo(cutoff) < 0)
+                {
+                    try
+                    {
+                        Directory.Delete(dir, true);
+                        _log.Info($"已清理过期日志目录：{dirName}");
+                    }
+                    catch (Exception ex)
+                    {
+                        _log.Warn($"清理过期日志目录失败：{dirName}", ex);
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/src/CncCollector/log4net.config b/src/CncCollector/log4net.config
index cc5a66e..93e4afa 100644
--- a/src/CncCollector/log4net.config
+++ b/src/CncCollector/log4net.config
@@ -11,10 +11,9 @@
   <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
     <file value="logs\collector.log" />
     <appendToFile value="true" />
-    <rollingStyle value="Composite" />
-    <datePattern value="yyyyMMdd" />
-    <maxSizeRollBackups value="30" />
-    <maximumFileSize value="10MB" />
+    <rollingStyle value="Size" />
+    <maxSizeRollBackups value="10" />
+    <maximumFileSize value="50MB" />
     <staticLogFileName value="true" />
     <layout type="log4net.Layout.PatternLayout">
       <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
@@ -25,10 +24,9 @@
   <appender name="ErrorFileAppender" type="log4net.Appender.RollingFileAppender">
     <file value="logs\collector_error.log" />
     <appendToFile value="true" />
-    <rollingStyle value="Composite" />
-    <datePattern value="yyyyMMdd" />
-    <maxSizeRollBackups value="30" />
-    <maximumFileSize value="10MB" />
+    <rollingStyle value="Size" />
+    <maxSizeRollBackups value="10" />
+    <maximumFileSize value="50MB" />
     <staticLogFileName value="true" />
     <threshold value="ERROR" />
     <layout type="log4net.Layout.PatternLayout">