Air filtering device, air filtering control method and fuel cell system

The invention discloses an air filtering device, an air filtering control method and a fuel cell system.The air filtering device comprises an air inlet pipeline, a filtering device, a backflow pipeline, a pressurizing device and a backflow adjusting structure, the air inlet pipeline is used for communicating with an air inlet, the filtering device is arranged on the air inlet pipeline, and the backflow pipeline is communicated with the pressurizing device; the filtering device is arranged on the air inlet pipeline and used for filtering air on the air inlet pipeline, a backflow inlet and a backflow outlet are formed in the backflow pipeline, the backflow inlet is connected to the air outlet end of the filtering device, the backflow outlet is connected to the air inlet end of the filtering device, and the pressurizing device is used for pressurizing the air. The backflow adjusting structure is arranged on the backflow pipeline so that air flows into the air inlet of the fuel cell through the air inlet pipeline