The invention discloses a fully automatic ceiling lamp scrubbing device, which comprises a round rail and rolling wheels arranged at the lower end of the round rail in a rolling way, wherein the upper surface of the round rail is provided with a rail groove; a rail trolley is arranged in the rail groove in a rolling way; the upper end of the rail trolley is provided with a base; a rotating motor is arranged at the lower end of the side surface of the base; the inner side surface of the base is provided with a chute; a flat plate type linear motor is glidingly arranged on the chute; the front side of the base is fixedly provided with an air cylinder; the upper end of the flat plate type linear motor is provided with a first electric hydraulic push rod; the upper end of the first electric hydraulic push rod is provided with a step motor; the upper end of the step motor is provided with a scrubbing box. The fully automatic ceiling lamp scrubbing device has the beneficial effects that dust at the surface and the inside of a ceiling lamp can be automatically cleaned; the dismounting is not needed; the cleaning speed is high; the efficiency is high; particularly, inside gaps of the ceiling lamp can also be scrubbed; the functions are rich; the operation is simple and convenient; the practicability is high.