At present, the single-rotor plant protection drone has been eliminated from the market, and the aerodynamic performance of the quad-rotor in many multi-rotor plant protection farm sprayer drone is higher than that of the six-rotor and eight-rotor. The most important thing is that our mist spray nozzle can penetrate the crop canopy to reach For the roots of crops, this spraying effect is much higher than that of pressure nozzle and centrifugal nozzle