diff --git a/homeassistant/components/unifi/switch.py b/homeassistant/components/unifi/switch.py
index 236ca02ab2d..2b7965d1095 100644
--- a/homeassistant/components/unifi/switch.py
+++ b/homeassistant/components/unifi/switch.py
@@ -266,8 +266,8 @@ class UniFiBlockClientSwitch(UniFiClient, SwitchDevice):
 
     @property
     def is_on(self):
-        """Return true if client is blocked."""
-        return self.client.blocked
+        """Return true if client is allowed to connect."""
+        return not self.client.blocked
 
     @property
     def available(self):
@@ -275,9 +275,9 @@ class UniFiBlockClientSwitch(UniFiClient, SwitchDevice):
         return self.controller.available
 
     async def async_turn_on(self, **kwargs):
-        """Block client."""
-        await self.controller.api.clients.async_block(self.client.mac)
+        """Turn on connectivity for client."""
+        await self.controller.api.clients.async_unblock(self.client.mac)
 
     async def async_turn_off(self, **kwargs):
-        """Unblock client."""
-        await self.controller.api.clients.async_unblock(self.client.mac)
+        """Turn off connectivity for client."""
+        await self.controller.api.clients.async_block(self.client.mac)
diff --git a/tests/components/unifi/test_switch.py b/tests/components/unifi/test_switch.py
index 915646b9856..f84efa5dada 100644
--- a/tests/components/unifi/test_switch.py
+++ b/tests/components/unifi/test_switch.py
@@ -342,11 +342,11 @@ async def test_switches(hass, mock_controller):
 
     blocked = hass.states.get("switch.block_client_1")
     assert blocked is not None
-    assert blocked.state == "on"
+    assert blocked.state == "off"
 
     unblocked = hass.states.get("switch.block_client_2")
     assert unblocked is not None
-    assert unblocked.state == "off"
+    assert unblocked.state == "on"
 
 
 async def test_new_client_discovered(hass, mock_controller):