Vertical multi-stage magnetic drive pump

The invention belongs to the technical field of pump equipment, and relates to a vertical multi-stage magnetic drive pump. Comprising a pump cylinder, a motor, a magnetic driver and a driven shaft, the magnetic driver comprises an inner magnetic rotor, an outer magnetic rotor and an isolation sleeve, the inner magnetic rotor is connected with a driving shaft of the motor, the outer magnetic rotor wraps the inner magnetic rotor, the outer magnetic rotor is connected with the driven shaft, and the driven shaft is connected with the magnetic driver. The spacer sleeve is arranged between the inner magnetic rotor and the outer magnetic rotor, the upper end of the spacer sleeve is open, the open end of the spacer sleeve is fixedly connected with an upper cover of the pump cylinder, blades are further arranged on the outer side wall of the outer magnetic rotor, and a backflow hole is formed in the lower end of the driven shaft. A forced reverse circulation structure is adopted, the blades are additionally arranged o