The invention relates to an intelligent heat reservoir. The intelligent heat reservoir is composed of a solar water heater, a heat exchanger I, a water tank I, a water tank I temperature sensor, a control water pump, a controller, a water inlet pipe control valve II, a water inlet pipe II, a water tank II temperature sensor, a heat exchanger II, a heat supply heat reservoir, a water outlet pipe, a water tank II, a water inlet pipe control valve I and a water inlet pipe I. The intelligent heat reservoir has the characteristics that the intelligent heat reservoir conducts coordinated control over the solar water heater and the heat supply heat reservoir through the controller to make the water temperature be kept at a set value constantly, and electric energy is saved.