The utility model provides a centrifugal pump includes: the pump case, the pump case is inside still to be formed with the delivery chamber, and the delivery chamber is located the centre of two suction chambers, and the delivery chamber is used for pumping the fluid, centrifugal pump still includes: annular impeller wheel chamber, impeller wheel chamber sets up in the pump case, set up two water inlets, set up annular delivery port in impeller wheel chamber's circumference in impeller wheel chamber's axial, wherein, two water inlets of impeller wheel chamber communicate with two suction chambers respectively, impeller wheel chamber's annular delivery port and delivery chamber intercommunication, wherein, two water inlets of impeller wheel chamber are circular, and the diameter is greater than the diameter of pump shaft, is the diameter of impeller wheel chamber's water inlet 450 500 the millimeter for when the flow promoted, the velocity of flow of the impeller wheel chamber's in the centrifugal pump water inlet was still comparatively mild, thereby in having solved prior art, under the very fast circumstances of the velocity of flow, the fluid easily takes place cavitation phenomena in impeller wheel chamber, and then leads to the fact the problem of cavitation to impeller wheel chamber inner rotor's damage.