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During the operation of plant protection UAV, the vertical distribution law of the rotor wind field and the wind speed have a direct impact on the transport effect of droplets and the disturbing effect of the crop canopy. Taking the vertical distribution of the six-rotor UAV as an object, the simulation model of the rotor wind field using the numerical simulation technology based on the lattice Boltzmann method was established when UAV flying. In addition, according to the orthogonal test method, the influence of multi-feature parameter fusion on the vertical distribution of wind field and wind speed was studied. The simulation results showed that the vertical distribution wind field was symmetrically distributed perpendicular to the flight direction. When the flight height and flight speed increased or the operating load decreased, the wind field intensity was gradually weakened; the vertical distribution wind field was inclined along the crosswind direction, and when the crosswind wind speed was greater than 3m/s, the lateral inclination of the wind field exceeded 45°. Besides, a miniature wireless wind speed acquisition system was developed based on the constant temperature difference thermal chip, and a multi-factor field verification test of the vertical distribution characteristics of the wind field of the plant protection UAV was carried out. The results showed that the vertical distribution law of the rotor wind field between the simulation and the field test was basically the same, the relative error was small, and the vertical distribution of wind field had good consistency. The numerical simulation method can effectively simulate the unsteady flow during the flight process of plant protection UAV, and the simulation and field test results would provide a theoretical basis for the study of the droplet deposition of the plant protection UAV.