Steam adding device of sewage tank

The utility model relates to a steam adding device of a sewage tank. The steam adding device is characterized by comprising the sewage tank (1), wherein a steam introducing pipe (2) is arranged on the top of the sewage tank (1); the tail end of the steam introducing pipe (2) is communicated with a steam coil pipe (3) fixed transversely; the steam coil pipe (3) floats on the water surface of the sewage tank (1); three rows of steam holes (3.1) are formed at the bottom of the steam coil pipe (3); and each steam hole (3.1) is communicated with steam branch pipes (4) arranged vertically. According to the steam adding device of the sewage tank disclosed by the utility model, the steam coil pipe is arranged below the steam introducing pipe and floats on the water surface of the sewage tank; furthermore, the plurality of rows of steam branch pipes are connected to the lower surface of the steam coil pipe, and therefore, steam can be effectively introduced into water of the sewage tank; in addition, the steam introducing pipe, the steam coil pipe and the steam branch pipes cannot shake violently, so that the steam adding device is difficult to damage, long in service life and high in safety.