A ceiling lamp includes a housing, a light source received in the housing, a transparent/translucent cover fixed to a bottom of the housing and a frame connected to the housing and located over the housing. The housing includes a top plate, a pair of wings extending downwardly from the top plate and two lids fixed to the top plate and the wings. The frame includes a top wall and two side walls and two arms extending downwardly from the top wall. Each lid forms a slot therein, and each arm forms a protrusion to engage in the slot to thereby secure the housing to the frame.