Waterway system of milk foam coffee machine

The waterway system of the milk foam coffee machine comprises a water tank, a water pump and a heating device, the heating device comprises a main body, a first water inlet pipe, a water outlet pipe, a second water inlet pipe, an air outlet pipe and a heating body, a heating cavity and a steam cavity which are independently and separately arranged are formed in the main body, and the heating cavity communicates with the first water inlet pipe and the water outlet pipe; the heating body is arranged in the heating cavity, the heating cavity is arranged on the periphery of the steam cavity, and the steam cavity is communicated with the second water inlet pipe and the air outlet pipe. The water tank is communicated with the first water inlet pipe through the water pump, the water outlet pipe is communicated with the three-way electromagnetic valve, the three-way electromagnetic valve is respectively communicated with the water inlet pipe and the funnel, and the air outlet pipe is communicated with the milk foam d