diff --git a/apps/mosquito/migrations/0016_auto_20200603_1741.py b/apps/mosquito/migrations/0016_auto_20200603_1741.py
new file mode 100644
index 0000000..251b818
--- /dev/null
+++ b/apps/mosquito/migrations/0016_auto_20200603_1741.py
@@ -0,0 +1,17 @@
+# Generated by Django 2.2.4 on 2020-06-03 09:41
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mosquito', '0015_devicepoststatistic_increment'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='devicepoststatistic',
+            unique_together={('device_id', 'date')},
+        ),
+    ]
diff --git a/apps/mosquito/models.py b/apps/mosquito/models.py
index 7557444..f3ca588 100644
--- a/apps/mosquito/models.py
+++ b/apps/mosquito/models.py
@@ -67,6 +67,7 @@ class DevicePostStatistic(models.Model):
     update_time = models.DateTimeField(auto_now=True, blank=True, null=True, verbose_name='更新时间')
 
     class Meta:
+        unique_together = ('device_id', 'date')
         verbose_name = '设备日志统计表'
         verbose_name_plural = verbose_name