Dustproof axial flow fan for air supply and exhaust

The utility model relates to the technical field of axial flow fans, in particular to a dustproof axial flow fan for air supply and exhaust, which comprises a fan frame, a first dustproof cover and a second dustproof cover, an axial flow fan body is arranged inside the fan frame, a central rotating seat is arranged at the center inside the first dustproof cover, the bottom end of the fan frame is fixedly connected with a supporting bottom frame, and the bottom end of the supporting bottom frame is fixedly connected with the fan frame. A conveying inner pipe is arranged on the inner bottom wall of the supporting bottom frame, and a one-way valve is arranged on the surface of the conveying inner pipe. Through the fan frame, the first dust cover, the second dust cover, the central rotating seat, the rotating cover frame, the strip-shaped shovel strip, the electric push rod, the clamping seat and the clamping groove, dust removal operation can be conducted on the surfaces of dust-proof nets in the first dust cove