Abstract：To solve the problems of the traditional orchard sprayer with the lack of droplet penetration and the small amount of droplet deposition on the back of blade, the trapezoidal orchard air delivery electrostatic sprayer was independently designed for Yshaped directional growth fruit trees by electrostatic spray technology. To optimize the working parameters of the orchard electrostatic sprayer and clarify the influence of parameters on the atomization effect of droplets, the Fluent software was used to establish the coupling simulation model of air flow field, discrete fog field and space electric field. The simulation test results show that the droplets charging process are focused on electrodes near the nozzle. The closer the distance to the nozzle electrode is， the greater the electric field intensity is. The farther the distance from the nozzle is, the faster the electric field intensity attenuation is. The best charged area is 20 mm away from nozzle. With the decreasing of electrode gap, the space superposition of electric field intensity becomes more uniform.Under the conditions with charging voltage of 8 kV and nozzle distance of 150 mm, the best droplets charge effect can be achieved with the largest deposition amount. Taking charging voltage, wind speed and speed as test factors, the droplet deposition performance test results show that with the increasing of charging voltage, the overall deposition quantity of droplets in the blade is increased， and the penetrability of droplet is significantly strengthened. With the increasing of export wind speed,the overall deposition quantity of droplets is increased firstly with latter decreasing. When the export wind speed is 20 m·s-1, the best droplet deposition is obtained. The decreasing effect sequence of parameters in the experiment on droplet deposition is spray distance, export wind speed， charging voltage and speed.The result of field test is basically consistent with that of simulation.
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