A new compound suction fertilizer device based on Venturi principle was developed to improve the efficiency of fertilizer absorption. The new device was made up with one Venturi tube and a suction cavity. The size of Venturi tube was chosen according to the GB/T 2624—2006. The suction cavity was covered on the Venturi tube. The performance of new device was tested to compare with traditional equipment. The result showed that the vacuum negative pressure at throat of compound fertilizer suction device was decreased from zero to -0.71MPa with the increase of pressure difference between inlet and outlet from 0.02MPa to 0.32MPa. Moreover, the absorption flux was increased linearly with the increase of absolute value of vacuum negative pressure. When the pressure difference between inlet and outlet reached 0.28MPa, the vacuum negative pressure was dropped to the lowest value of -0.71MPa, and then the absorption flux reached its maximal value. The total amount of fertilizer could be increased by number of suction pipes, so that it can improve the efficiency by several times compared with the conventional single Venturi tube, although the single suction absorption flux of compound device was slightly reduced due to the pressure loss. In conclusion, the new compound fertilizer suction device could be precisely changed by changing the inlet pressure when inlet and outlet pressure difference was between 0.02MPa and 0.28MPa, which could be useful for precise control.