The invention provides a rotating mechanism applied to a vacuum pump and belongs to the technical field of machinery. The rotating mechanism applied to the vacuum pump comprises a rotating piece, a front end cover, a rear end cover, a rotor and an air inlet valve; the rotating piece is in a hollow barrel shape, and a plurality of tooth pieces which are arranged in a radial manner are evenly distributed on the lateral side of the rotating piece; the front end cover is arranged on the front end face of the rotating piece; the rear end cover is parallel to the front end cover and is arranged on the rear end face of the rotating piece; the rotor is in a rod shape and penetrates through the rotating piece, the front end cover and the rear end cover; and the air inlet valve is arranged on the lateral side of the rotating piece and communicated with the rotating piece. The rotating mechanism applied to the vacuum pump has the beneficial effects of being simple in structure, good in thermal radiation and long in service life.