Waterproof ceiling lamp

The utility model discloses a waterproof ceiling lamp which comprises an installation support, a bottom shell is connected below the installation support, a lens is arranged in the bottom shell, a lampshade is arranged below the bottom shell, a waterproof ring is arranged between the bottom shell and the lampshade, and an outer ring is connected between the outer side of the lower portion of the lampshade and the bottom shell in a sleeved mode. The lampshade is buckled in the outer ring, a first circular ring is arranged on the outer side wall of the lampshade along the circumference, the bottom shell is connected to the outer side of the lampshade in a sleeving mode from the upper portion, a second circular ring is connected to the outer side wall of the bottom shell, the section of the second circular ring is of an L-shaped structure, and the vertical side of the second circular ring is inserted between the first circular ring and the inner wall of the outer ring downwards. An annular groove matched with th