Machining equipment for multi-stage centrifugal pump impeller and using method of machining equipment

The invention discloses machining equipment for a multi-stage centrifugal pump impeller and a using method of the machining equipment, and relates to the technical field of impeller machining. The machining equipment comprises a tank body, a tank door is hinged to the right side of the front face of the tank body, a motor is fixedly installed at the bottom end in the tank body, and a circular plate is fixed to the bottom of the outer wall of the tank body; a round rod is fixed to the top face of a rotating shaft of the motor, an arc-shaped magnetic fan is fixed to the outer wall of the round rod, a round chuck is fixed to the top face of the round rod, a sand pump penetrates through and is fixedly installed at the bottom of the left side of the tank body, a square hose is fixedly installed on the top face of the sand pump, and a round groove plate is fixed to the top of the outer wall of the round rod. A plurality of arc grooves are formed in the top face of the circular groove plate, and a sand blasting open