Die-casting dome light source

The utility model relates to the technical field of dome light sources, in particular to a die-casting type dome light source which comprises a fixing cylinder, an empty groove is formed in the outer side wall of the fixing cylinder, and a rotating ring is rotationally connected to the inner side wall of the empty groove. Through the arrangement of the empty groove, the arc rod, the retracting and releasing barrel, a spring buckle, a connecting block, a mounting block, a clamping block and a retracting and releasing groove, a worker can extrude a spring block which is in sliding connection with the inner side wall of the groove, so that the spring block can extrude the spring buckle which is in clamping connection with the interior of a limiting hole, and a rotating ring can rotate to drive the retracting and releasing barrel to rotate; the folding and unfolding barrel rotates to drive a connecting block fixedly connected with the top end to rotate, the connecting block drives an arc rod fixedly connected wit