Composite heat pump system

The invention discloses a composite heat pump system. The system comprises an air source heat pump system and a solar energy heat-exchanging system. The air source heat pump system comprises a compressor, a four-way valve, a water side heat exchanger, a throttling device, a fin type heat exchanger, a gas-liquid separator, and related pipelines. A loop is formed by the compressor and the gas-liquidseparator through the four-way valve and the pipelines. A loop is formed by the four-way valve, the water side heat exchanger, the throttling device, and the fin type heat exchanger connected in turn. The solar energy heat-exchanging system comprises a solar energy heat collecting pipe, a water pump, a hot water storage tank, and related pipelines. The interior of the hot water storage tank is provided with a heat exchange coil. The heat exchange coil is in parallel connection with the fin type heat exchanger through the pipelines. A circular loop is formed by the connection between the waterchannel of the hot water