Abstract: A self-cleaning device of a filtering net of air conditioner is installed on a filtering frame in an air inlet of a dust spiral case of a package air conditioner and is disposed outside the filtering net. A filtering net guide rail with slots is installed on an upper frame and a lower frame. The filtering net is fixed on the filtering net frame by the slots of guide rails. The cleaning device of the filtering net includes a sweeping assembly with a brush, a drive motor fixed on the sweeping assembly, a transmission mechanism connected to the drive motor, a rack group installed on the left and right side of the filtering net, a dust collecting box installed under the filtering net for collecting dust, and a dust exchanging device is disposed between the dust collecting box and the filtering net.