Multi-stage centrifugal pump

The invention relates to the technical field of multi-stage centrifugal pumps, and discloses a multi-stage centrifugal pump which comprises a pump body and a driving motor for driving the pump body. The pump body comprises a pump body outer shell and a plurality of single-stage shells, guide vanes and rotatable impellers are installed in the single-stage shells through pump shafts, and the multiple single-stage shells are installed in a series-connection sealing mode. Water spraying mechanisms are arranged in the single-stage shells, multiple stages of cavities of the multi-stage centrifugal pump can be irrigated at the same time through simultaneous operation of the water spraying mechanisms in the multiple single-stage shells, the influence of the air binding phenomenon is reduced through the efficient water irrigation mode, and in the first state, the water spraying mechanisms conduct water irrigation on the interiors of the single-stage shells, and in the second state, the water spraying mechanisms conduc