Self-priming centrifugal pump

The invention relates to the technical field of centrifugal pumps, and particularly discloses a self-priming centrifugal pump which comprises a pump body, the pump body comprises a volute, an impeller, a pump shaft, a motor and a water inlet pipe, the impeller is arranged in the volute, the motor is arranged on the rear side of the volute, the rear end of the pump shaft is connected with the output end of the front side of the motor, and the front end of the pump shaft penetrates through the volute and is connected with the middle of the rear side of the impeller. The water inlet pipe communicates with the middle of the front side of the volute, the upper end of the volute is connected with a liquid storage box, the middle of the upper end of the liquid storage box is connected with a water outlet pipe, the lower end of the water outlet pipe penetrates through the liquid storage box and communicates with an inner cavity of the volute, an induction module is arranged on the left side of the inner cavity of the