Spiral slice type vacuum pump

A rotary blade type vacuum pump relates to an improvement of the structure of the rotary blade type vacuum pump. The utility model namely solves the problems of the present rotary blade type vacuum pump that the relative positions of a tangent point and an exhaust outlet are not reasonable and the work efficiency is low. The utility model provides the rotary blade type vacuum pump whose the relative positions of the tangent point and the exhaust outlet are reasonable and the work efficiency is high. The utility model comprises a pump body (18). A rotor (11) of a sliding vane (8) is arranged in the pump cavity (16) of the pump body (18). An oil tank (13) is arranged on the pump body (18) at the outside of the pump cavity (16). The structure of the utility model is characterized in that the exhaust outlet (6) in the pump cavity (16) is arranged on the upper part of the tangent point (38) of the rotor (11) and the pump cavity (16).