Abstract: Disclosed is an automatic dust-removing and cleaning device for a filter net of an air-conditioner which has a filter net (2) with an end to end sealing ring structure. The filter net (2) comprises a net frame (21) provided with gear sockets (211), and a mesh (22). A driving gear (5) is installed at one corner of an air inlet frame (1) of the air conditioner and meshed with the gear sockets (211) of the net frame (21). Driven gears (6) are installed at the other three corners of the air inlet frame (1) of the air conditioner and meshed with the gear sockets (211) of the net frame (21). A drive mechanism (12) drives the driving gear (5) to rotate. A dust-collecting box (3) is installed at the bottom of the air inlet frame (1) of the air conditioner and provided with a water inlet and a water outlet. The water inlet is connected to a water inlet pipe (8) and the water outlet is connected to a water outlet pipe (9).