This pump is a new type of anti-corrosion circulating water multi-purpose vacuum pump with high-power multi head pumping. The machine is designed for internal and external circulating water, with single meter and multi tube operation. It is equipped with five pumping heads, which can be used separately or in parallel, and can be used for multiple purposes. It has the characteristics of no oil, no pollution, high power, low noise, long service life, convenience and flexibility, and water and electricity saving. The exterior adopts an electrostatic spray anti-corrosion shell, and the main pump body and impeller water separator are all made of anti-corrosion engineering plastic materials.