The invention discloses a mechanical-electrical integrated solar power generation device and belongs to the technical field of new energy. The device is composed of a solar thermal collector, a solar working medium workstation and a generator unit mechanical-electrical integrated combined body. The solar working medium workstation is composed of a heating water tank, a circulation hot water pump, a pressure reducing valve, a cooler, a heat pump, a solar working medium backflow device, a hydraulic pump and a solar working medium work device. A shell assembly, a stator assembly, a planet outer rotor assembly, an air inlet pipe, an air return pipe and other components are arranged in the generator unit mechanical-electrical integrated combined body. The solar thermal collector and the heating water tank communicate through a water pipe and the circulation hot water pump, the solar working medium work device communicates with the air inlet pipe in the combined body through an air conveying pipe, and the solar working medium backflow device communicates with the air return pipe in the combined body through a pipeline, the cooler and the pressure reducing valve. Compared with the photovoltaic power generation technology at home and abroad at present, the manufacturing cost of a generator unit can be greatly reduced, and the unit device efficiency is remarkably improved.