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Aiming at the problems of unreasonable distribution of wind field and large loss of liquid, an air delivery system of tower sprayer was designed and its structural parameters were optimized. ANSYS software was used to simulate the air delivery system of sprayer, and the optimal parameters of the rectifier plate structure, deflector taper and deflector on both sides were determined by comparing the wind speed difference of the two sides outlet and the wind speed of the upper outlet under different structural parameters. The experimental results showed that the influence of the structure parameters of the rectifier on the symmetry of wind field on both sides of the sprayer from large to small was as follows: guide vane angle, guide vane number and guide vane length. The diversion table greatly improved the symmetry of wind field. The length and angle of the baffle had great influence on the wind speed of the upper outlet. When the number of guide blades of the rectifier plate was 12, the length was 200mm, the angle was 0°, and the taper of the guide table was 60°, when the contraction angle of air duct 1 was 2°, the symmetry of wind field and vertical distribution uniformity on both sides of the sprayer were optimized. According to the optimal parameters, the sprayer air delivery system was set up and the wind speed test was carried out. The results showed that the relative error between the simulated wind speed and the test value was less than 10%, and the simulation results were reliable. Field experiments showed that the difference of droplet deposition density on both sides of the sprayer was less than 9%, that was, the droplet deposition on both sides was uniform. The average density of droplets deposited in the canopy of fruit trees was 75.69 particles/cm2, which indicated that the optimized tower sprayer had good droplet penetration. The vertical distribution of fog droplets in the lower layer was the largest, followed by the middle layer and the smallest in the upper layer, which was consistent with the distribution of high spindle tree canopy. The symmetry of the wind field and droplet deposition characteristics on both sides of the optimized tower sprayer was high, and the research results can provide reference for the optimization of the air delivery system of tower sprayer.