diff --git a/homeassistant/components/reolink/icons.json b/homeassistant/components/reolink/icons.json
index 0b019277a77..bcfea0bebd1 100644
--- a/homeassistant/components/reolink/icons.json
+++ b/homeassistant/components/reolink/icons.json
@@ -365,6 +365,9 @@
       "battery_state": {
         "default": "mdi:battery-charging"
       },
+      "day_night_state": {
+        "default": "mdi:theme-light-dark"
+      },
       "wifi_signal": {
         "default": "mdi:wifi"
       },
diff --git a/homeassistant/components/reolink/sensor.py b/homeassistant/components/reolink/sensor.py
index ecad555b481..85de03dd1a3 100644
--- a/homeassistant/components/reolink/sensor.py
+++ b/homeassistant/components/reolink/sensor.py
@@ -107,6 +107,17 @@ SENSORS = (
         value=lambda api, ch: BatteryEnum(api.battery_status(ch)).name,
         supported=lambda api, ch: api.supported(ch, "battery"),
     ),
+    ReolinkSensorEntityDescription(
+        key="day_night_state",
+        cmd_id=33,
+        cmd_key="296",
+        translation_key="day_night_state",
+        device_class=SensorDeviceClass.ENUM,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        options=["day", "night", "led_day"],
+        value=lambda api, ch: api.baichuan.day_night_state(ch),
+        supported=lambda api, ch: api.supported(ch, "day_night_state"),
+    ),
 )
 
 HOST_SENSORS = (
diff --git a/homeassistant/components/reolink/strings.json b/homeassistant/components/reolink/strings.json
index a22c93611b6..80d9156e420 100644
--- a/homeassistant/components/reolink/strings.json
+++ b/homeassistant/components/reolink/strings.json
@@ -825,6 +825,14 @@
           "chargecomplete": "Charge complete"
         }
       },
+      "day_night_state": {
+        "name": "Day night state",
+        "state": {
+          "day": "Color",
+          "night": "Black & white",
+          "led_day": "Color with floodlight"
+        }
+      },
       "hdd_storage": {
         "name": "HDD {hdd_index} storage"
       },
diff --git a/tests/components/reolink/snapshots/test_diagnostics.ambr b/tests/components/reolink/snapshots/test_diagnostics.ambr
index f8d5318e9bd..b034122e1fc 100644
--- a/tests/components/reolink/snapshots/test_diagnostics.ambr
+++ b/tests/components/reolink/snapshots/test_diagnostics.ambr
@@ -62,6 +62,10 @@
       0,
     ]),
     'cmd list': dict({
+      '296': dict({
+        '0': 1,
+        'null': 1,
+      }),
       'DingDongOpt': dict({
         '0': 2,
         'null': 2,