The centrifugal pump uses the centrifugal force generated by the impeller to work. Before starting the centrifugal pump, the eggshell and suction pipe must be filled with water, and then the motor must be started to make the pump shaft drive the impeller and water to make a high rotation movement. Under the effect of centrifugal force, the water is used to the outer edge of the impeller, and flows into the pressurized water pipe of the pump through the channel of the volute pump housing. Since the water is used under the effect of centrifugal force to form a vacuum, the water in the suction pool is pressed into the pump housing under the effect of atmospheric pressure, The impeller keeps rotating, so that the water continuously flows in and out under the action of the impeller, reaching the purpose of water delivery.