The invention relates to the technical field of power equipment, in particular to a cooling device for a wall-through bushing insulator of an electric heat storage furnace under a 800 DEG C working environment, in particular to a cooling device capable of working under a 800 DEG C environment for a wall-through bushing insulator. The cooling device is characterized in that the wall-through bushinginsulator of the electric heat storage furnace passes through and is connected to a wall body of the electric heat storage furnace; the wall-through bushing insulator of the electric heat storage furnace is full of cooling medium, is provided with a low temperature medium inlet and a high temperature medium outlet; two ends of a medium conduit are connected to the low temperature medium inlet andthe high temperature medium outlet respectively; and meanwhile, a cooler and a circular driver are connected in series in a pipeline of the medium conduit to make the cooling medium form a high-low temperature circulation path. The cooling device has the characteristics of simple structure, reasonable design, safety, stability and reliability in use, and lower production cost; the high temperature resistance of the wall-through bushing insulator can be improved effectively; and the strength requirement of the wall-through bushing insulator in the 800 DEG C working environment is met.