Pneumatic cleaning composite filter screen filtering device

The invention discloses a pneumatic cleaning composite filter screen filtering device which comprises a grit chamber and a screen type filtering device, a pneumatic cleaning assembly is arranged at the other end of the screen type filtering device, and the screen type filtering device comprises a support device, a conveying belt type filter screen and a driving device used for movement of the filter screen. The pneumatic cleaning assembly comprises gas making equipment, a pneumatic cleaning mechanism and exhaust mechanisms, a gas outlet of the gas making equipment communicates with a gas inlet of the pneumatic cleaning mechanism through a gas conveying pipeline, the pneumatic cleaning mechanism is fixedly arranged on the top of the support device, and the exhaust mechanisms communicate with the pneumatic cleaning mechanism. And air outlets of the plurality of exhaust mechanisms are opposite to the filter screen. The device is simple in structure, complete in function and free of manual operation, silt and oth