Engine air propeller stopping control system and method for parachute landing unmanned aerial vehicle

The invention provides an engine air propeller stopping control system and method for a parachute landing unmanned aerial vehicle, relates to the technical field of aircraft recovery, and can realize quick propeller stopping, accurate control of propeller stopping angle and position, locking and unlocking of a parachute and guarantee that the parachute is not opened during propeller stopping. The system comprises a propeller position sensor used for collecting position data of propeller; a propeller stopping controller used for calculating the position data of the propeller and controlling a propeller pitch changing mechanism, a propeller stopping servo motor and a parachute locking device to act; the propeller pitch changing mechanism is used for changing the distance between propellers under the control of the propeller stopping controller; the propeller stopping servo motor is used for rotating under the control of the propeller stopping controller and providing braking torque for stopping the propeller an