Sponge city building photovoltaic integrated utilization system

The invention relates to a sponge city building photovoltaic integrated utilization system. The sponge city building photovoltaic integrated utilization system comprises a roof green ecological system, an automation rainwater irrigation device, a solar PV/T system and an underground rainwater refrigeration and heating device, wherein the roof green ecological system, the automation rainwater irrigation device, the solar PV/T system and the underground rainwater refrigeration and heating device are connected with a building. The sponge city building photovoltaic integrated utilization system has the advantages that the green ecological system is built on a roof, so that the cyclic utilization of the rainwater is achieved and the rainwater utilization rate is increased; the electric energy obtained by the solar PV/T system is stored to an accumulator and is supplied for an axial flow draught fan and an centrifugal water pump to use, and thus the automation of rainwater irrigation and underground rainwater refri