The plant protection UAV is mainly composed of the flight platform, flight control and the spray mechanism. It controls the flight platform through the flight control system to guide the flight in accordance with a predetermined route to conduct spraying operation. In terms of function, the flight control can be divided into stability augmentation flight control, semi-automatic and fully automatic flight control. NovAtel and BDS autonomous navigation boards can provide High-precision position reference and calibration for the last two flight controls, and output heading, pitch and roll parameters by combining with airborne IMU, to help the flight control to control and adjust the flight attitude of the aircraft. Meawhile, before the opration, it also requires a satellite positioning device to calibrate the position of the operation target, to identify the operation areas independently, thus improving operating efficiency.