Main shaft assembly of plastic magnetic pump

The utility model discloses a main shaft assembly of a plastic magnetic pump. The main shaft assembly comprises a main shaft, an impeller, a first sliding bearing, a second sliding bearing and an inner magnetic rotor. The first sliding bearing and the second sliding bearing are assembled on the main shaft, the impeller is located at one end of the main shaft, the inner magnetic rotor is located on the end, opposite to the impeller, of the main shaft, the second sliding bearing is adjacent to the first sliding bearing, and the first sliding bearing and the second sliding bearing are located between the impeller and the inner magnetic rotor. By means of the structure, the main shaft assembly can avoid radial force borne by an isolating sleeve in use. Therefore, service life of the isolating sleeve is prolonged, maintenance times are reduced, and maintenance cost is reduced.