Air-conditioning system based on coupling of water vapour energy and sewage source

The invention, which relates to the technical field of the energy saving and energy utilization, provides an air-conditioning system based on coupling of water vapour energy and a sewage source. On the basis of combination of the water vapour energy collector with the sewage source, a cold and heat source absorbed by a heat pump is selected according to different outdoor temperature and humidity and indoor load requirements, thereby guaranteeing reliability of the using environment of the heat pump and improving the utilization rate of the heat pump. Meanwhile, the het absorbed by the water vapour energy collector is fully utilized to carry out preheating on a sewage pool at a transition season and the sewage pool is used for carry out heat storage, thereby improving the heating efficiency of the system. Besides, on the basis of the principle of the mutual supplement and utilization of the energy, the energy can be distributed and utilized effectively; and the extra heat and cold energy in the waste water and the water vapour energy are used based on cooperation, thereby providing the cold-heat air conditioning for the building with high efficiency and low power consumption.