Filter screen cleaning and sterilizing device and air purifier

The utility model provides a filter screen cleaning and sterilizing device and an air purifier. The filter screen cleaning and sterilizing device comprises a base; the filter screen is arranged on the base, and a photocatalyst coating is arranged on the filter screen; the driving assembly can drive the filter screen to rotate around the axis of the filter screen; the fixing support is arranged on the base, a cleaning brush strip and a UV lamp are arranged on the fixing support, the cleaning brush strip makes contact with the filter screen, and the UV lamp is suitable for irradiating the filter screen. When the driving assembly drives the filter screen to rotate, the cleaning brush strip cleans impurities and pollutants on the filter screen, the UV lamp irradiates the filter screen to play a catalytic role on the photocatalyst coating arranged on the filter screen, bacteria adsorbed on the filter screen are promoted to be decomposed so as to be killed, and the filter screen can be cleaned or replaced without d