The utility model relates to a high-purity electrical distiller which is composed of an evaporation boiler, a condensing and cooling device, a water level automatic control device, an overflow device, pipelines for the connection of the evaporation boiler, the condensing and cooling device and the water level automatic control device, circuits for the control of the evaporation boiler, the condensing and cooling device and the water level automatic control device, etc., wherein the evaporation boiler uses high temperature resistant glass as the basal body, the outer wall of the evaporation boiler is coated with one layer of semiconductor metal oxide, and the outer wall is also coated with conductive silver; electrodes A, B, C on the boiler are connected with contacts of AC contactors in the circuits by conducting wires; the top cover of the evaporation boiler, the condensing and cooling device and a distilled water recovery device in the system are all composed of glass devices, and accordingly the quality of distilled water is pure. The utility model is suitable for use in medical and health institutions, and dirt on the glass devices is easy to clean.