Abstract: An apparatus for treating industrial wastes through electrolysis is disclosed. Steam or waste steam is utilized to heat the electrolyzing apparatus so as to separate contamination materials from the waste water, thereby treating the waste water. An electrolyzing tank has a waste water inlet on the bottom thereof, and a steam supply pipe is wound around the electrolyzing tank, for heating the electrolyzing tank during a passing of steam through the pipe. An insulating tube is formed inside the electrolyzing tank, and is coated with an insulating material on inside thereof, for insulating the electrolyzing tube from its contents. A cathode tube is installed within the insulating tank, for serving as a cathode during an electrolysis. An agitator having agitating blades is fixed on a shaft, the shaft is inserted into the center of the cathode tube, and anodes are attached on tips of the blades.