Abstract: In order to study the effect of wind speed on droplet drift during the field application of four-rotor plant protection drones, a experiment with 6 different wind speed 0.1 m/s,2.4 m/s,2.5 m/s,3.1 m/s,3.4 m/s and 4.0 m/s was operated. The result shows that with the wind speed increased, the starting point of the droplet in the sedimentation zone produce displacement. When wind speed at 3.1 m/s, starting point of droplet deposition is shifted by 1.75 m and when wind speed at 4.0 m/s, starting point of droplet deposition is shifted by 3.50 m; Wind speed has a significant effect on the droplet coverage at the collection point in the sedimentary area, and has no significant effect on the droplet density. It has significant effects on the droplet coverage and droplet density at the collection point in the drift area. The greater the wind speed, the farther the drift of the droplets is. When the wind speed is 4 m/s, there will still be droplets deposited at 50 m at the collection point. This study provides a reference for the setting of the drift buffer when the plant protection drone operates under different environmental wind speeds.