The invention discloses a method and a device for managing output torque, belonging to the field of hybrid electric vehicles. The method comprises the following steps: determining the current mode of a engine according to the current rotating speed of the engine; determining the hybrid system efficiency and fuel efficiency at the current rotating speed according to the current rotating speed and the characteristic performance curve of the engine under the non-idling mode; regulating the operating point of the engine and outputting corresponding torque according to the hybrid system efficiencyand the fuel efficiency; and under the idling mode, judging whether the current charging state is less than a preset threshold value, if so, entering the idling generating mode, and amending requirement torque according to the current charging state, if not, stopping the use of the engine. The invention also discloses the device for managing the output torque. The invention realizes higher fuel conversion efficiency and achieves optimal effect of oil consumption to achieve the aim of energy saving.