diff --git a/internal/tools/cron_task.go b/internal/tools/cron_task.go
index 82ce95eda9..84d9193958 100644
--- a/internal/tools/cron_task.go
+++ b/internal/tools/cron_task.go
@@ -103,6 +103,15 @@ func netlock(rdb redis.UniversalClient, key string, ttl time.Duration) bool {
 	return ok
 }
 
+// netUnlock release redis lock.
+func netUnlock(rdb redis.UniversalClient, key string) error {
+	_, err := rdb.Del(context.Background(), key).Result()
+	if err != nil {
+		return errs.Wrap(err)
+	}
+	return nil
+}
+
 func cronWrapFunc(config *CronTaskConfig, rdb redis.UniversalClient, key string, fn func()) func() {
 	enableCronLocker := config.CronTask.EnableCronLocker
 	return func() {
@@ -114,6 +123,9 @@ func cronWrapFunc(config *CronTaskConfig, rdb redis.UniversalClient, key string,
 
 		// when acquire redis lock, call fn().
 		if netlock(rdb, key, 5*time.Second) {
+			defer func() {
+				_ = netUnlock(rdb, key)
+			}()
 			fn()
 		}
 	}
diff --git a/internal/tools/cron_task_test.go b/internal/tools/cron_task_test.go
index 0bea8a4361..43be7855c3 100644
--- a/internal/tools/cron_task_test.go
+++ b/internal/tools/cron_task_test.go
@@ -38,6 +38,12 @@ func TestDisLock(t *testing.T) {
 
 	// set different key
 	assert.Equal(t, true, netlock(rdb, "cron-2", 2*time.Second))
+
+	// set key and release
+	assert.Equal(t, true, netlock(rdb, "cron-3", 5*time.Second))
+	assert.Equal(t, nil, netUnlock(rdb, "cron-3"))
+	//retrieve set key
+	assert.Equal(t, true, netlock(rdb, "cron-3", 5*time.Second))
 }
 
 //func TestCronWrapFunc(t *testing.T) {