The invention discloses a gear surface cleaning device which comprises supporting legs, a driving shaft, a connecting frame, a motor, a vibration motor, a first spring, a sliding plate, a driving wheel, a driven shaft, a driven wheel, a conveyor belt, a fixing column, a lantern ring, a second spring, a water storage shell, a fixed frame, a rack, a material receiving plate, a sponge block, a filterresidue filter net, a sponge pad, a water pumping pipe, a water pump, a water drainage pipe, a spraying nozzle, a connecting rod, a cleaning hairbrush and gears. The gear surface cleaning device is novel in design, automatic feeding of the cleaned gears is achieved, it is guaranteed that the gears are orderly placed on the surface of the conveyor belt, automatic cleaning of the gear surfaces is facilitated, the labor intensity of the automatic feeding by a worker is reduced, the labor efficiency of the worker is improved, and use by the worker is facilitated; and the conveyor belt is arrangedto drive the gears to rotate under the effect of the rack, meanwhile, the matching action of the cleaning hairbrush is used for cleaning the gear surfaces, the cleaning effect of the gear surface isimproved, and the gear surfaces are conveniently and effectively cleaned thoroughly.