An unmanned aerial vehicle, comprising a control module, a fuselage main body, motor arms, a plurality of lift motors and lift propellers, wherein the control module is provided in the fuselage main body of the unmanned aerial vehicle; the motor arms are fixedly provided on two sides of the fuselage main body in parallel to one another and to the fuselage main body; the lift motors are electrically connected with the control module; two ends of the motor arms are respectively provided with at least two of the lift motors; the lift motors are provided in the motor arms, and the lift propellers are fixedly provided on the motor arms; one lift motor is fixedly connected with at least one lift propeller; the control module is configured to preset a correspondence between two ends of each motor arm and the corresponding lift motors; the control module is configured to control each lift motor to be initiated to drive the corresponding lift propeller to rotate to work; the control module is also configured to determine whether a lift motor fails, if so, acquire a position on the motor arm corresponding to the failing lift motor, and adjust the power of other lift motors in all the other lift motors corresponding to a position different from the failing lift motor, wherein the unmanned aerial vehicle is further comprising third steering engines and two vertical tails, wherein the two vertical tails are provided on two sides of a vertical direction of the tail end of the fuselage main body respectively; at least one third steering engine is provided in each vertical tail; each third steering engine is fixedly connected with one third control surface on the vertical tail; the third steering engines are electrically connected with the control module; the control module is configured to control the third steering engines to adjust the deflecting directions of the third control surfaces. lift motors and lift propellers, wherein the control module is provided in the fuselage main body of the unmanned aerial vehicle; the motor arms are fixedly provided on two sides of the fuselage main body in parallel to one another and to the fuselage main body; the lift motors are electrically connected with the control module; two ends of the motor arms are respectively provided with at least two of the lift motors; the lift motors are provided in the motor arms, and the lift propellers are fixedly provided on the motor arms; one lift motor is fixedly connected with at least one lift propeller; the control module is configured to preset a correspondence between two ends of each motor arm and the corresponding lift motors; the control module is configured to control each lift motor to be initiated to drive the corresponding lift propeller to rotate to work; the control module is also configured to determine whether a lift motor fails, if so, acquire a position on the motor arm corresponding to the failing lift motor, and adjust the power of other lift motors in all the other lift motors corresponding to a position different from the failing lift motor, wherein the unmanned aerial vehicle is further comprising third steering engines and two vertical tails, wherein the two vertical tails are provided on two sides of a vertical direction of the tail end of the fuselage main body respectively; at least one third steering engine is provided in each vertical tail; each third steering engine is fixedly connected with one third control surface on the vertical tail; the third steering engines are electrically connected with the control module; the control module is configured to control the third steering engines to adjust the deflecting directions of the third control surfaces.