The invention relates to an agricultural greenhouse heating supply system based on seasonal solar energy soil heat storage. The agricultural greenhouse heating supply system comprises a solar heat collection subsystem, a greenhouse radiator, a soil heat exchanger, a water circulation subsystem and a control subsystem. The water circulation subsystem is respectively connected with the solar heat collection subsystem, the greenhouse radiator and the soil heat exchanger, heat exchange between circulating water in the water circulation subsystem, the solar heat collection subsystem, the greenhouse radiator and the soil heat exchanger is carried out, the control subsystem is connected with the water circulation subsystem to control the water circulation subsystem to be connected and disconnected, the greenhouse radiator is located inside a greenhouse, the soil heat exchanger is located in soil below the greenhouse, and the solar heat collection subsystem, the water circulation subsystem and the control subsystem are located outside the greenhouse. Compared with the prior art, the agricultural greenhouse heating supply system has the advantages of being high in energy using rate, low in carbon, environmentally friendly, low in operation cost and the like.