diff --git a/lego/sys/log/logger.go b/lego/sys/log/logger.go
index 0e33042d0..34fe77fbb 100644
--- a/lego/sys/log/logger.go
+++ b/lego/sys/log/logger.go
@@ -15,6 +15,7 @@ func newSys(options *Options) (sys *Logger, err error) {
 		CupTime:    time.Duration(options.CupTimeTime) * time.Hour, //日志切割间隔时间
 		Compress:   options.Compress,                               //是否压缩 disabled by default
 		MaxBackups: options.MaxBackups,                             //最大备份数
+		MaxSize:    options.MaxSize,                                //最大日志文件大小
 		LocalTime:  true,                                           //使用本地时间
 	}
 	if !options.IsDebug {
diff --git a/lego/sys/log/options.go b/lego/sys/log/options.go
index 0073a56c5..c265cf9bd 100644
--- a/lego/sys/log/options.go
+++ b/lego/sys/log/options.go
@@ -24,6 +24,7 @@ type Options struct {
 	CupTimeTime  int        //日志分割时间 单位 小时
 	MaxAgeTime   int        //日志最大保存时间 单位天
 	MaxBackups   int        //最大备份日志个数
+	MaxSize      int        //最大文件大小
 	Compress     bool       //是否压缩备份日志
 }
 
@@ -100,6 +101,7 @@ func newOptions(config map[string]interface{}, opts ...Option) (options *Options
 		CupTimeTime:  24,
 		MaxAgeTime:   7,
 		MaxBackups:   250,
+		MaxSize:      100 * 1024 * 1024,
 		Compress:     false,
 		Encoder:      TextEncoder,
 		CallerSkip:   3,