Upper air-exhausting and liquid-return device used in electrolytic cell

The utility model provides an upper air-exhausting and liquid-return device used in an electrolytic cell. The upper air-exhausting and liquid-return device comprises the electrolytic cell, wherein an air cover is arranged on the electrolytic cell, the top of the air cover is connected with three air-exhausting pipes which are merged into a main air-exhausting pipe, a ball-shaped liquid-return device is welded in the middle of the main air-exhausting pipe, and an opening formed in the bottom of the liquid-return device is connected with a liquid-return pipe which is also connected with a liquid-return opening formed in the side surface of the air cover. By the upper air-exhausting and liquid-return device, the air-exhausting mode of the electrolytic cell is changed from side air exhausting to upper air exhausting; by designing and mounting the air cover on the electrolytic cell, the air-exhausting effect of the electrolytic cell is enhanced, and the operation environment around the electrolytic cell is improved; since the liquid-return device is mounted on the main air-exhausting pipe, the condensed water flows backwards and thus the problem of change in process conditions caused by the variation in the concentration of the solution due to the volatilization of water is avoided.