The motor of the electric diaphragm pump drives the diaphragm on the left and right ends of the plunger to move back and forth through the reducer. In the left and right two pump chambers, there are up and down four one-way ball valve diaphragm movement, resulting in a change in the volume of the working chamber, forcing the four one-way ball valve alternately opened and closed, so that the liquid constantly inhaled and discharged. No need to irrigate water, strong self-absorption. Directly will be transferred media and transmission machinery parts separate, so the media will never leak out. And pump itself without shaft fluid seal, the service life is greatly extended