Heat storage water tank

The invention discloses a heat-storage water tank. A heating liner is arranged inside the water tank, a heat-conducting medium with a boiling point of about 30 DEG C is filled inside the heating liner, the water tank is provided with a scaling injection pipe, an interlayer is formed on the edge inside the water tank, and a phase-change heat storage material with a melting point of about 50 DEG C is filled in the interlayer. By virtue of the design, the circulating speed of the heat-conducting medium can be improved, and the heat exchange speed of a solar thermal collector and the water tank can be improved; and moreover, when the temperature of hot water is higher than 50 DEG C, the heat storage material absorbs a great deal of heat from the hot water and stores the heat, and the heat is released when the water temperature is reduced, thereby ensuring that the water temperature is stabilized at about 50 DEG C.