Internal circulation energy-saving and environment-friendly power generation system

The invention belongs to the technical field of power generation equipment, does not consume fossil resources, and particularly relates to an internal circulation energy-saving environment-friendly power generation system which comprises a power generator and an impeller driving the power generator to rotate, the power generator is connected with a user power utilization or grid-connected loop and a water supply power utilization loop, and the water supply power utilization loop comprises a lift water pump. The lift water pump conveys water in the water storage tank to the position above the impeller through a pipeline to form water flow gravity to wash the impeller to rotate, the water storage tank is matched with the pipeline and the lift water pump to conduct internal water circulation, and therefore the system is not limited by natural water sources such as rivers and reservoirs and geographic positions in the process that water energy is converted into electric energy. The water potential energy serves a