diff --git a/app/src/main/java/com/lt2333/simplicitytools/activity/SettingsActivity.kt b/app/src/main/java/com/lt2333/simplicitytools/activity/SettingsActivity.kt
index d80b9ea9..f66664ca 100644
--- a/app/src/main/java/com/lt2333/simplicitytools/activity/SettingsActivity.kt
+++ b/app/src/main/java/com/lt2333/simplicitytools/activity/SettingsActivity.kt
@@ -1315,6 +1315,15 @@ class SettingsActivity : MIUIActivity() {
 
             add(LineV())
             add(TitleTextV(resId = R.string.lock_screen))
+            add(
+                TextSummaryWithSwitchV(
+                    TextSummaryV(
+                        textId = R.string.lock_screen_clock_display_seconds,
+                        tipsId = R.string.only_official_default_themes_are_supported
+                    ),
+                    SwitchV("lock_screen_clock_display_seconds")
+                )
+            )
             add(
                 TextSummaryWithSwitchV(
                     TextSummaryV(
diff --git a/app/src/main/java/com/lt2333/simplicitytools/hook/app/SystemUI.kt b/app/src/main/java/com/lt2333/simplicitytools/hook/app/SystemUI.kt
index f0fddaca..53387bf4 100644
--- a/app/src/main/java/com/lt2333/simplicitytools/hook/app/SystemUI.kt
+++ b/app/src/main/java/com/lt2333/simplicitytools/hook/app/SystemUI.kt
@@ -41,6 +41,7 @@ object SystemUI: AppRegister() {
             StatusBarBigMobileTypeIcon, //大移动类型
             BatteryPercentage, //电量百分比
             CustomMobileTypeText, //自定义移动类型文本
+            LockScreenClockDisplaySeconds, // 锁屏时钟显示秒
         )
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/lt2333/simplicitytools/hook/app/systemui/LockScreenClockDisplaySeconds.kt b/app/src/main/java/com/lt2333/simplicitytools/hook/app/systemui/LockScreenClockDisplaySeconds.kt
new file mode 100644
index 00000000..019f32af
--- /dev/null
+++ b/app/src/main/java/com/lt2333/simplicitytools/hook/app/systemui/LockScreenClockDisplaySeconds.kt
@@ -0,0 +1,112 @@
+package com.lt2333.simplicitytools.hook.app.systemui
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.os.Handler
+import android.provider.Settings
+import android.util.AttributeSet
+import android.util.Log
+import android.widget.LinearLayout
+import android.widget.TextView
+import com.lt2333.simplicitytools.util.*
+import com.lt2333.simplicitytools.util.xposed.base.HookRegister
+import de.robv.android.xposed.XC_MethodHook
+import java.lang.reflect.Method
+import java.text.SimpleDateFormat
+import java.util.*
+
+object LockScreenClockDisplaySeconds : HookRegister() {
+
+    private var nowTime: Date = Calendar.getInstance().time
+
+    override fun init() {
+        hasEnable("lock_screen_clock_display_seconds") {
+            "com.miui.clock.MiuiBaseClock".findClass(getDefaultClassLoader())
+                .hookAfterConstructor(
+                    Context::class.java,
+                    AttributeSet::class.java
+                ) {
+                    try {
+                        val viewGroup = it.thisObject as LinearLayout
+
+                        val d: Method = viewGroup.javaClass.getDeclaredMethod("updateTime")
+                        val r = Runnable {
+                            d.isAccessible = true
+                            d.invoke(viewGroup)
+                        }
+
+                        class T : TimerTask() {
+                            override fun run() {
+                                Handler(viewGroup.context.mainLooper).post(r)
+                            }
+                        }
+                        Timer().scheduleAtFixedRate(
+                            T(),
+                            1000 - System.currentTimeMillis() % 1000,
+                            1000
+                        )
+                    } catch (e: java.lang.Exception) {
+                    }
+                }
+            "com.miui.clock.MiuiLeftTopClock".hookAfterMethod(
+                getDefaultClassLoader(),
+                "updateTime"
+            ) {
+                updateTime(it, false)
+            }
+
+            "com.miui.clock.MiuiLeftTopLargeClock".hookAfterMethod(
+                getDefaultClassLoader(),
+                "updateTime"
+            ) {
+                updateTime(it, false)
+            }
+
+            "com.miui.clock.MiuiCenterHorizontalClock".hookAfterMethod(
+                getDefaultClassLoader(),
+                "updateTime"
+            ) {
+                updateTime(it, false)
+            }
+
+            "com.miui.clock.MiuiVerticalClock".hookAfterMethod(
+                getDefaultClassLoader(),
+                "updateTime"
+            ) {
+                updateTime(it, true)
+            }
+        }
+    }
+
+    private fun updateTime(it: XC_MethodHook.MethodHookParam, isVertical: Boolean) {
+        val textV = it.thisObject.getObjectField("mTimeText") as TextView
+        val c: Context = textV.context
+
+        Log.d(
+            "lock_screen_clock_display_seconds",
+            "updateTime: " + it.thisObject.javaClass.simpleName
+        )
+        val is24 = Settings.System.getString(
+            c.contentResolver,
+            Settings.System.TIME_12_24
+        ) == "24"
+
+        nowTime = Calendar.getInstance().time
+
+        textV.text = getTime(is24, isVertical)
+
+    }
+
+
+    @SuppressLint("SimpleDateFormat")
+    private fun getTime(is24: Boolean, isVertical: Boolean): String {
+        var timePattern = ""
+        if (isVertical) { //垂直
+            timePattern += if (is24) "HH\nmm\nss" else "hh\nmm\nss"
+        } else { //水平
+            timePattern += if (is24) "HH:mm:ss" else "h:mm:ss"
+        }
+        timePattern = SimpleDateFormat(timePattern).format(nowTime)
+        return timePattern
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 3b93d290..0c94969d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -213,4 +213,5 @@
     <string name="enhancedMode">Enhanced Mode</string>
     <string name="enhancedMode_summary">Pass some validation in the application</string>
     <string name="rear_display">Rear Display (11Ultra)</string>
+    <string name="lock_screen_clock_display_seconds">Lock screen clock display seconds</string>
 </resources>