Abstract: In order to deeply understand the application of plant protection UAV in precision agriculture,master the drift of spray droplets sprayed by plant protection UAV,aiming at the phenomenon of spray droplet drift of plant protection UAV under different wind speeds,The effects of different wind speeds on droplet drift are analyzed.The test platform is mainly DJI T30 plant protection UAV,the spray drops of 6 plant protection UAVs were compared and analyzed by using the coefficient of variation CV value and sample standard deviation s value.The results show that,when the wind speed is 0.2～4.1 m/s,the average droplet coverage in the deposition area is 1.48%～2.48%,the average droplet density is 9.1～15.8 dot/cm~2;when the wind speed is 3.2 m/s,the droplet deposition effect in the deposition area is the best,when the wind speed exceeds 3.2 m/s,the amount of mist droplets deposited in the sedimentary area will gradually decrease,the larger the initial position displacement of droplets in the deposition area,the worse the uniformity of droplet deposition in the deposition area.Therefore,in the spraying operation of plant protection UAV,the operation weather with wind speed not exceeding 3.2 m/s shall be selected to achieve the optimal operation effect.