Constant temperature zinc liquid chute

The utility model provides a constant-temperature zinc launder, which consists of a heater case, a zinc launder and a thermocouple, wherein the bottom surface and the surrounding walls of the heater case are all provided with refractory masonry; the shell of the heater case is made of steel plates; the surrounding walls of internal cavity are provided with resistance wires; the zinc launder is arranged in the heater case with the furnace cover arranged on the heater case; the thermocouple is arranged in the heater case. The utility model provides a constant-temperature zinc launder for complex purification device to remove the zinc residue in the hot-dip galvanizing liquid, achieves continuous purification of liquid zinc, and avoids the interference of the hot dip zinc galvanizing operations of the steel plates in the purification process caused by temperature drop.