Scroll oil-free mechanical vacuum pump is a new type of dry mechanical vacuum pump evolved from the scroll compressor. Scroll oil-free mechanical vacuum pump works. The curve constituting the volute for the scroll vacuum pump is involute. Fixed vortex called stator, rotating vortex called the rotor. Rotor without rotation to a certain radius of gyration translation revolution. As the rotor moves in translation, a suction chamber and a compression chamber are formed between the two scrolls. The volume of the working chamber after the inhalation of gas is reduced with the movement of the rotor, and the exhaust gas is moved from the outer ring to the center to continuously perform the processes of aspiration, compression and exhaust. In order to reduce the weight of the pump vortex, the substrate with aluminum, the surface coated with a special layer of PTFE to increase wear resistance and corrosion resistance. The pressure difference between adjacent working chambers of the pump scroll body is small, so the gas leakage is small, and the change of the driving torque of the pump is small. Therefore, the pump noise is low and the vibration is small. The pump is characterized by light weight, small size, horizontal structure, can be directly drawn from the atmospheric pressure to 10-1Pa, is a wide range of use of rough pumping dry vacuum pump.