The utility model discloses a hearth water proof device for electrothermal intermediate temperature bath furnace, the edge (2) of the pot mouth is arranged on the external housing working table (1) of the electrothermal intermediate temperature bath furnace, The utility model is characterized in that the upper edge (2) of the pot mouth is connected with pendulous major baffle water bars (3), the external housing working table (1) of the electrothermal intermediate temperature bath furnace near the pot is connected with upward secondary water bars (4). The utility model can effectively prevent washing water from flowing into the electrothermal intermediate temperature bath hearth, causing equipment failure and ensure the normal operation of the electrothermal intermediate temperature bath furnace. The utility model has the advantage of simple structure.