Stainless steel screw pump is the use of screw rotation to suction and discharge liquid. Stainless steel screw pump intermediate screw as the active screw, driven by the original idea of ​​rotation, the screw on both sides of the driven screw, with the active screw for reverse rotation. The main, driven screw thread are double-headed thread. Because of the mutual engagement of the screws and the close cooperation of the screw with the inner wall of the liner, one or more sealed spaces are separated between the suction and discharge of the pump. Following the rolling and meshing of the screws, these sealed spaces are constantly formed at the suction side of the pump, sealing the liquid in the suction chamber therein and continuously displacing in the axial direction of the screw shaft from the suction chamber to the discharge end, closing the liquid in each space Continuous discharge, as a nut screwed forward in the continuous forward situation, as the stainless steel screw pump is the basic working principle. The stainless steel screw pump mainly comprises an electric motor, a stator and a rotor. The electric motor is connected with a transmission shaft through a decelerator, a coupling and a driving shaft to drive the rotor to make eccentric rolling in the stator. In the suction chamber, Of the inner surface of the pump body and form a PTFE coating or FEP coating. The transmission shaft is connected with the rotor through a second universal joint, an intermediate shaft and a first universal joint, wherein the second universal joint, the intermediate shaft and the first universal joint surface are sprayed and form an alumina ceramic coating. The utility model has the beneficial effects that the stainless steel screw pump solves the transmission frustration of the strongly aggressive viscous medium. Life expectancy 5-10 times higher than ordinary austenitic stainless steel screw pump, the use of titanium or other corrosion resistant alloy, the cost reduced by 50% -70%. Particularly suitable for sea water, brine and other raw materials for the chemical industry.