Abstract: In order to optimize the sprinkler head of the plant protection drone, the sprinkler head model of the four-rotor plant protection drone was established by using SolidWorks. The pressure on the inner wall of the sprinkler head and the distribution of the liquid speed were simulated and analyzed. The gas-liquid spraying situation of the sprinkler head was analyzed by using ANSYS software, and the flying height was 2～6 m and the spray width was 3 m. The grooving depth is 2.53 mm, the diameter of the jet hole is 3 mm, the centroid distance is 0.65 mm and the grooving Angle is 42°, which can meet the operation requirements of the plant protection UAV.