Venturi fertilizer and micro irrigation system or irrigation area entrance of water supply pipe control valve are installed parallelly, when used the control valve will close small, causing control valve to have a certain pressure difference before and after, so that water flow through the installed Venturi fertilizer's branch, using water flow through the Venturi tube generated vacuum suction, the fertilizer solution from the open fertilizer barrel evenly breathe into the pipeline system to fertilize. Venturi fertilizer has low cost, easy to use, fertilizer concentration stable, no need to add power and other characteristics, its disadvantage is the pressure loss large, generally suitable for irrigation area small occasions. Venturi fertilizer has low cost, easy to use, fertilizer concentration stable, no need to add power and other characteristics, its disadvantage is the pressure loss large, generally suitable for irrigation area small occasions.