The pump body of the water pump is composed of various corrosion-resistant imported materials. The pump body is separated from the motor, and the pump body has five mechanical metal components without wear. It has properties such as oil resistance, heat resistance, alkali resistance, corrosion resistance, and chemical resistance. This water pump combines the advantages of self priming pump and chemical pump, with advantages such as self priming function, thermal protection, stable operation, long-term continuous idle operation, and long-term continuous load operation.