The floor heating water separator is the control center of the whole indoor geothermal heating. It has the functions of shunt and partial pressure. When the heat medium flows into the room, it enters the main rod of the water separator after passing through the multifunctional filter. In this link, the filter filters out impurities in the heat medium to prevent impurities from entering the underground pipe network and blocking the pipeline. The main rod is installed horizontally, and the heat medium is evenly distributed on the branch pipes by using the principle of equal height and equal pressure. After passing through the heat exchange system, each branch pipe flows back to the main pole and then flows into the heating system through the water inlet. In addition, the water mixing device is added in the self-heating system, that is to say, after heat exchange, the temperature of the heat medium (water) is still very high, and after passing through the water mixing system, it flows into the main rod of the water separator to continue circulating, thus saving energy while heating.