A control method for a hybrid electric vehicle after a battery failure, the hybrid electric vehicle comprising a motor also able to be used as a generator, a transmission (R, 2, 4, 6; 1, 3, 5, 7), an engine, a power battery and at least one clutch (C1, C2) wherein the engine is connected to the transmission via the at least one clutch, the engine is connected to the motor via the at least one clutch, the power battery is connected to the motor via a relay, and the power battery is connected to a low voltage electric appliance system of the vehicle via the relay; and the control method comprises: after monitoring that a failure occurs in the power battery, judging whether the failure is a specific type of failure or not, wherein the specific type of failure is a battery failure under which the relay of the power battery can be disengaged after a certain time after the battery failure is detected, and the motor of the hybrid electric vehicle is capable of being used as a generator; if so, setting the relay of the power battery to be disengaged after a preset time; before the relay is disengaged, coordinating and controlling the power battery, the engine, the transmission and the motor of the hybrid electric vehicle, to enable operation states thereof to meet a preset voltage control mode entering condition by controlling the engine to be in a start state, the engine being started through the at least one clutch when the vehicle runs; according to a driver request torque, selecting a gear of the transmission with an expected transmission ratio to be connected to the engine; and controlling a torque of the motor to a preset torque range smaller than 0 and approximate to 0, and adjusting a rotation speed of the motor to a preset rotation speed range; and controlling the motor to enter into a voltage control mode after the relay of the power battery is set to be disengaged after the preset time, the motor is connected with the engine through the at least one clutch to generate electric power as a generator, and the electric power generated by the motor is supplied to the low-voltage electric appliance system of the vehicle. after monitoring that a failure occurs in the power battery, judging whether the failure is a specific type of failure or not, wherein the specific type of failure is a battery failure under which the relay of the power battery can be disengaged after a certain time after the battery failure is detected, and the motor of the hybrid electric vehicle is capable of being used as a generator; if so, setting the relay of the power battery to be disengaged after a preset time; before the relay is disengaged, coordinating and controlling the power battery, the engine, the transmission and the motor of the hybrid electric vehicle, to enable operation states thereof to meet a preset voltage control mode entering condition by controlling the engine to be in a start state, the engine being started through the at least one clutch when the vehicle runs; according to a driver request torque, selecting a gear of the transmission with an expected transmission ratio to be connected to the engine; and controlling a torque of the motor to a preset torque range smaller than 0 and approximate to 0, and adjusting a rotation speed of the motor to a preset rotation speed range; and controlling the motor to enter into a voltage control mode after the relay of the power battery is set to be disengaged after the preset time, the motor is connected with the engine through the at least one clutch to generate electric power as a generator, and the electric power generated by the motor is supplied to the low-voltage electric appliance system of the vehicle.