Solar injection and heat pump composite system

The utility model provides a solar injection and heat pump composite system. The composite system comprises a heat pump circulation subsystem. The heat pump circulation subsystem comprises a first heat exchanger and a second heat exchanger. The system further comprises an ejector, a first four-way valve, a photovoltaic heat collection generator and a working medium pump. The first four-way valve is provided with a first port, a second port, a third port and a fourth port; the ejector is provided with a main path inlet, a main path outlet and a branch path inlet; the main path outlet is selectively communicated with the first end of the first heat exchanger, the main path inlet is communicated with the first port, the branch inlet is communicated with the second port, the third port is selectively communicated with the second heat exchanger, and the photovoltaic heat collection generator and the working medium pump are sequentially connected between the fourth port and the second end ofthe first heat exchanger