Solar heat-collecting water supply system

The utility model discloses a solar heat collection water supply system. The system comprises a solar main pipe heat collection circulating system, a household heat exchange circulating system, a control system, a water supply and return valve group and pipelines, the solar main pipe heat collection circulating system comprises a solar heat collector, an expansion tank and a heat collection circulating pump, the expansion tank is used for supplementing water to the solar heat collector, and the heat collection circulating pump is used for water circulation in the solar heat collector and the expansion tank; the household heat exchange circulating system comprises a household heat storage water tank and a heat supply pipeline pump, a heat exchange coil and an electric auxiliary heating pipeare arranged in the household heat storage water tank, and the heat supply pipeline pump is used for water circulation in the solar main pipe heat collection circulating system and the household heatstorage water tank; the c