Variable pitch control method and control device of aircraft and aircraft

The invention discloses a variable pitch control method and device of an aircraft and the aircraft. The method comprises the steps that a flight controller obtains propeller pitch information according to a received flight control instruction; the variable pitch controller identifies the propeller pitch information to obtain target propeller pitch information; displacement information of each steering engine is obtained through calculation according to the target propeller pitch information, and the displacement information is sent to the corresponding steering engine; and the steering engine moves according to the displacement information to control the movement of blades of the aircraft. The variable pitch controller is adopted to process the propeller pitch information, and a flight controller is not needed to process the propeller pitch information, so that the control program of the flight controller and the complexity of external wiring are reduced, the structure of the aircraft is simplified, and the f