Energy-saving electric water heater

The utility model relates to an energy-saving electric water heater, comprising electric heating pipes 2, a water inlet, a water outlet, and a heat exchange cavity. The utility model is characterized in that the heat exchange cavity adopts an internal and external communicated sandwich structure; an external cavity 4 is communicated with a water inlet; a hot water pipe is positioned in an internal cavity; the heat transfer medium 1 is arranged between the electric heating pipes. As the heat transfer medium is adopted, the water temperature is favorably improved, and the energy is saved. As the heat exchange cavity with the sandwich structure is adopted, the water temperature is favorably kept, and the heat energy is prevented from diffusing.