Automatic suction type agricultural water pump

The utility model provides an automatic extraction water pump for agricultural use, comprising a pump body that equipped with water feed pipe, a water discharge pipe, a transmission shaft and a shaft sleeve. Two ends of the transmission shaft are connected to belt pulley and impeller. The water feed pipe is equipped with air extraction port that connects to the extraction pipe of evacuating equipment on the pump body. A setting block is mounted on the belt pulley, and the shaft sleeve is equipped with shaft tube that the swinging axis is mounted in. The swinging axis has its left end connecting the setting lever and its right end connecting the crank arm that opposites and contacts the setting block. The crank arm has its lower arm hinged with the piston rod of the evacuating equipment, its upper arm connected to the clutch lever hinged with the pump body. The upper arm of the crank arm is connected to the pump body by spring, and the pump body is connected to limit stop contacting with the clutch lever. The utility model can solves the problems that be driven by internal combustion engine, complex structure, high cost, inconvenient installation and complex operation of the existing water pump.