The invention relates to the technical field of heating equipment, and in particular, discloses a water storage electric hot water device. The water storage electric hot water device comprises a shell, a liner and an insulation layer; a magnesium rod, a water outlet pipe, a water inlet pipe, a water separator, a heating pipe, a temperature controller and a fireproof controller are arranged at thebottom of the shell; an outer coating layer comprises a first water soluble organic composite skin agent layer and an epoxy back paint layer; an inner coating layer comprises a second water soluble organic composite skin agent layer, a polyester finishing coat layer and a protective film layer; the water separator comprises a port pipe, a middle pipe and an end pipe; the inner diameters of the port pipe, the middle pipe and the end pipe are gradually reduced; and three through holes of 120 degrees are formed in the end pipe. The water storage electric hot water device has the characteristics of simple structure, better corrosion resisting effect and higher heat exchange efficiency.