An enclosure of an outdoor apparatus includes a first case, a second case and a gasket ring sealed between the first case and the second case. The first case includes a first cover and a flange portion extending from the first cover outwardly. The first case defines a first open surrounded by the flange portion. The flange portion defines a latching groove towards the first open. The second case includes a second cover and a stopper portion extending from the second cover outwardly. The stopper portion is received in the first open and matches with the flange portion. The cover defines a second open surrounded by the stopper portion and opposite to the first open. The stopper portion includes a latch portion protruded outwardly from the stopper portion to engage with the latching groove.