The invention provides an energy management strategy for a heavy-duty hybrid power special vehicle power system. The hybrid power system comprises an energy management controller and further comprisesa power unit and a battery pack which are controlled by the energy management controller; and the energy management strategy collects a current, the temperature and the SOC physical quantity of the battery pack to conduct closed-loop regulation on the loss power of the battery pack, the given loss of the battery pack is determined through the temperature and the SOC physical quantity of the battery pack, the actual loss of the battery pack is determined through the current of the battery pack, a difference value of the given loss and the actual loss is input into a closed-loop controller, after regulation through the closed-loop controller, the given power of the power unit is output, and the output power output by the power unit and the output power of the battery pack are superimposed and then act on a load. According to the energy management strategy, integrated power supplying of an electric driving system and a loading system is achieved, the power response speed of the hybrid power system is increased, the loss of the power battery pack is lowered, and the life of the power battery pack is prolonged.