Air filter box device at air inlet of air compressor

The utility model discloses an air filter box device at an air inlet of an air compressor, which comprises a filter box. A connector used for being connected with the air inlet of the air compressor is arranged on the filter box, the filter box consists of a three-dimensional frame, net plates, filter cloth and a panel, the panel is arranged on one surface of the three-dimensional frame, the connector is located on the panel, the net plates are disposed on other surfaces of the three-dimensional frame, and the filter cloth is arranged on the net plates. After being arranged at the air inlet of the air compressor, the air filter box device can filter air at the air inlet, accordingly air cleanness at the air inlet of the air compressor is effectively increased, service loads to an air filter element and a filter are reduced, and the service lives of the air filter element and the filter are prolonged. In addition, a total system is higher in filter function, service lives of lubricating oil, an oil filter elem