The vacuum pump of the fecal suction truck is powered by the chassis engine. The engine transfers power to the vacuum pump through the gearbox, power-take-off , and the transmission shaft. During the suction of pollution, the vacuum pump will take out the air in the sealed tank to form a negative pressure, and uses the atmospheric pressure outside the tank to press the dirt into the tank. When discharging, the vacuum pump will pressure the air outside the tank into the tank, and using air pressure to discharge dirt outside the tank. The product is used for the suction of feces, sewage and liquid mixed with small suspended debris. It has the characteristics of high suction efficiency, self-suction, self-drainage, direct irrigation and so on. It is widely used in the property area of municipal, agricultural, chemical factory and mining enterprise in small and medium-sized cities and towns.