Filter device of Roots blower

The utility model discloses a Roots blower filtering device, and belongs to the technical field of Roots blowers. Comprising a main body filtering device and a dust sweeping device, the main body filtering device prevents dust from entering the Roots blower, the dust sweeping device prevents the dust from being solidified on the surface of a filter screen to block the filter screen, the dust sweeping device is arranged at the top of the main body filtering device, the main body filtering device comprises a shell, an end cover and the filter screen, and the shell is of a hollow cylindrical structure; a through hole in the vertical direction is formed in the shell, the end cover is screwed to the top of the shell, the top of the end cover is square, the filter screen is embedded into the top of the end cover, the filter screen and the through hole of the shell are correspondingly arranged, the motor drives the brush to sweep away dust on the surface of the filter screen, the filter screen is prevented from bein