Vacuum pump

The utility model relates to the technical field of vacuum pumps, in particular to a vacuum pump. The sealing structure of the vacuum pump comprises an exhaust end oil sealing ring and a cavity side sealing spiral shaft sleeve which are sequentially arranged in the axial direction of a rotor, and the exhaust end oil sealing ring can seal a lubricating medium and prevent the lubricating medium from flowing towards a rotor cavity. When the cavity side sealing spiral shaft sleeve rotates, gas in the rotor cavity can be prevented from leaking out under the action of the cavity side sealing spiral teeth. An air outlet of the air sealing channel is used for introducing target pressure air between the exhaust end oil sealing ring and the cavity side sealing spiral shaft sleeve, air leaked by the cavity side sealing structure can be prevented from flowing towards the lubricating cavity, and lubricating media leaked by the bearing side sealing structure can also be prevented from flowing towards the rotor cavity. Acco