diff --git a/include/logger.hpp b/include/logger.hpp
index 2d1016d..1fda25f 100644
--- a/include/logger.hpp
+++ b/include/logger.hpp
@@ -20,7 +20,7 @@ enum class LogLevel
 class Logger
 {
    public:
-    static void init(const std::string& log_dir);
+    static void init(const std::string& log_dir, int keep_days = 30);
 
     static void log(LogLevel level, const std::string& msg);
 
@@ -31,11 +31,13 @@ class Logger
     static std::string log_directory;
     static std::string current_date;
     static std::string current_filename;
+    static int keep_days_;
 
     static std::string get_time_string();
     static std::string get_today_date();
     static void open_log_file();
     static void check_date_rollover();
+    static void cleanup_old_logs();
 };
 
 // 简化宏
diff --git a/src/logger.cpp b/src/logger.cpp
index 2ccd986..e998f1e 100644
--- a/src/logger.cpp
+++ b/src/logger.cpp
@@ -4,9 +4,11 @@ std::ofstream Logger::log_file;
 std::string Logger::log_directory;
 std::string Logger::current_date;
 std::string Logger::current_filename;
+int Logger::keep_days_ = 30;
 
-void Logger::init(const std::string& log_dir)
+void Logger::init(const std::string& log_dir, int keep_days)
 {
+    keep_days_ = keep_days;
     log_directory = log_dir;
 
     if (!std::filesystem::exists(log_directory)) std::filesystem::create_directories(log_directory);
@@ -36,6 +38,39 @@ void Logger::check_date_rollover()
     {
         current_date = today;
         open_log_file();
+        cleanup_old_logs();
+    }
+}
+
+void Logger::cleanup_old_logs()
+{
+    namespace fs = std::filesystem;
+
+    for (auto& entry : fs::directory_iterator(log_directory))
+    {
+        if (!entry.is_regular_file()) continue;
+
+        auto path = entry.path();
+        auto filename = path.filename().string();
+
+        if (filename.size() != 14 || filename.substr(4, 1) != "-" || filename.substr(7, 1) != "-")
+            continue;  // 跳过不符合 YYYY-MM-DD.log 的文件
+
+        std::tm file_tm{};
+        std::istringstream ss(filename.substr(0, 10));  // YYYY-MM-DD
+        ss >> std::get_time(&file_tm, "%Y-%m-%d");
+
+        if (ss.fail()) continue;
+
+        auto file_time = std::chrono::system_clock::from_time_t(std::mktime(&file_tm));
+        auto now = std::chrono::system_clock::now();
+
+        auto age = std::chrono::duration_cast<std::chrono::hours>(now - file_time).count() / 24;
+
+        if (age > keep_days_)
+        {
+            fs::remove(path);
+        }
     }
 }
 
@@ -75,6 +110,7 @@ std::string Logger::get_current_time_utc8()
 
     std::ostringstream ss;
     ss << std::put_time(&tm_now, "%Y%m%d%H%M%S") << std::setw(3) << std::setfill('0') << ms.count();
+
     return ss.str();
 }