diff --git a/simplelog/simplelog.go b/simplelog/simplelog.go
index 8b1690e..8eb3d4b 100644
--- a/simplelog/simplelog.go
+++ b/simplelog/simplelog.go
@@ -8,6 +8,15 @@ import (
 	"time"
 )
 
+const (
+	B uint64 = 1 << (10 * iota)
+	K
+	M
+	G
+	T
+	P
+)
+
 // 自定义日志
 
 type LogLevel struct {
@@ -39,6 +48,8 @@ var (
 type Logger struct {
 	fn           string
 	w            io.Writer
+	index        int
+	splitSize    uint64
 	timeFormat   string
 	loggerFormat string
 	flag         LevelFlag
@@ -55,6 +66,31 @@ func (l *Logger) PrintLog(level LogLevel, log string) {
 		return
 	}
 
+	for {
+		if len(l.fn) == 0 {
+			break
+		} else {
+			file := l.w.(*os.File)
+			info, _ := file.Stat()
+			currentSize := uint64(info.Size())
+			if currentSize < l.splitSize {
+				break
+			} else {
+				_ = file.Close()
+				for {
+					file, err := os.OpenFile(fmt.Sprintf("%s.%d", l.fn, l.index), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+					l.index++
+					if err != nil {
+						continue
+					} else {
+						l.w = file
+						break
+					}
+				}
+			}
+		}
+	}
+
 	pc, _, _, ok := runtime.Caller(2)
 	var f *runtime.Func
 	if ok {
@@ -103,6 +139,7 @@ type Option struct {
 	LogFormat  string
 	LevelFlag  LevelFlag
 	LogFile    string
+	SplitSize  uint64
 }
 
 type OptionFunc func(*Option)
@@ -146,6 +183,12 @@ func WithLogFile(filePath string) OptionFunc {
 	}
 }
 
+func WithSplitSize(size uint64) OptionFunc {
+	return func(option *Option) {
+		option.SplitSize = size
+	}
+}
+
 // 默认参数
 var defaultOption = &Option{
 	Writer:     os.Stdout,
@@ -153,6 +196,7 @@ var defaultOption = &Option{
 	LogFormat:  "%-22s %s %v --- [%20s] : %s\n",
 	LevelFlag:  FlagInfo | FlagWarn | FlagError | FlagDebug,
 	LogFile:    "",
+	SplitSize:  0,
 }
 
 // NewOption 构造 Option 参数
@@ -174,5 +218,6 @@ func NewLog(opts ...OptionFunc) *Logger {
 		loggerFormat: opt.LogFormat,
 		flag:         opt.LevelFlag,
 		fn:           opt.LogFile,
+		splitSize:    opt.SplitSize,
 	}
 }
diff --git a/simplelog/simplelog_test.go b/simplelog/simplelog_test.go
index d9fcac4..b15e664 100644
--- a/simplelog/simplelog_test.go
+++ b/simplelog/simplelog_test.go
@@ -51,6 +51,7 @@ func TestLogToFile(t *testing.T) {
 	log := NewLog(
 		WithLogFile(logFilePath),
 		WithLogFlag(FlagInfo|FlagDebug|FlagWarn),
+		WithSplitSize(1*K),
 	)
 
 	log.Debug("Debug 日志 测试")