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. <EOS>