Abstract: A waterway structure of the milk powder brewing machine comprising a water storage tank, a plurality of cooling pipes, a thick-film heater and a constant-temperature bin. A water inlet and outlet are formed in the water storage tank, and a spiral pipe is arranged in each cooling pipe. Water flowing from the water outlet is divided and respectively flows into water inlet of each cooling pipe of the plurality of cooling pipes. After the water flowing out from water outlets of the plurality of cooling pipes join together, the water flows into the thick-film heater to be heated to a temperature of 90-100° C. The hot water flows into the spiral pipe to be cooled and flows into the constant-temperature bin after being cooled to a preset temperature. The waterway structure of the present disclosure enhances the cooling effect, realizes instant heating, achieves reuse of energy, and improves the energy-saving effect.