The invention relates to a photovoltaic photo-thermal building integrated system. The photovoltaic photo-thermal building integrated system comprises a photovoltaic photo-thermal module, a hot water pipeline, a cold water pipeline, a flat plate type heat exchanger, a water tank, a direct-current circulating water pump, a storage battery, an inversion controller and an auxiliary heating device, wherein the flat plate type heat exchanger is connected with the photovoltaic photo-thermal module through the hot water pipeline and the cold water pipeline, the water tank is connected with the flat plate type heat exchanger through the direct-current circulating water pump, and the photovoltaic photo-thermal module is connected with the direct-current circulating water pump through the storage battery and the inversion controller. According to the photovoltaic photo-thermal building integrated system, building energy consumption can be greatly reduced, zero energy consumption can be achieved finally or the building energy consumption can approximate zero energy consumption, consumption of building fossil fuel can be reduced, the utilization rate of renewable energy sources such as solar energy can be increased, and carbon emission of a building is reduced. The photovoltaic photo-thermal building integrated system has the advantages that the heat conductivity coefficient is greatly increased, the heat transfer effect is better, system cost can be reduced, and the heat transfer efficiency can be improved.