Solar heat supply and heating system based on cross-seasonal soil heat storage

The invention relates to a solar heat supply and heating system based on cross-seasonal soil heat storage, and belongs to the field of solar heat supply. The system comprises a heat collection device, a buffer water tank, a buried pipe heat exchange device, an auxiliary heat source, a reversing circulation pump group composed of a plurality of circulation pumps and a plurality of valves, a temperature sensor, a controller controlling the opening and closing of the valve, an electric actuator and a connection pipeline, wherein an outlet of the heat collection device is connected with the buffer water tank through a first parallel valve and a second serial valve, and the heat collection device is sequentially connected with a first circulation pump, a first valve, a third valve and the buffer water tank; an edge port of the buried pipe heat exchange device is directly connected with the buffer water tank, and a central port of the buried pipe heat exchange device is connected with the buffer water tank through