The utility model discloses an automatic cleaning device of tray, include: clean the mechanism, including brush, cleaning device axle and supporting beam, the brush cover is epaxial at the cleaning device by I drive in the motor, the cleaning device axle is fixed in on the supporting beam to install rolling bearing unit additional, actuating mechanism moves the machine of carrying, motor III, travel switch and photoelectric sensor including motor II, jacking, and motor II is located the jacking and moves and carry a quick -witted lower part, and the lower part that the jacking moved the machine of carrying still is equipped with photoelectric sensor, motor III is connected with the chain convey machine, and chain convey machine lower part is equipped with travel switch, transmission device, including chain convey machine and cylinder, the chain convey machine is fixed in on the support. Can realize automatic make the return trip empty tray surface debris, the dust of cleaning, can reduce intensity of labour, reduce the consumption of manpower and time, in the transportation process of tray, can collect debris on the tray, avoid causing on -the -spot environmental pollution, simple structure, convenient operation improves and cleans efficiency and quality.