NOVELTY - Air-energy, solar energy and ground source heat pump biogas pool comprises: an anaerobic digestion system, a heat-insulation heat-preserving system, a solar water heating system, an air-energy heat pump system, a ground source heat pump system and a control system. The anaerobic digestion system comprises a pre-processing pool, a sludge pool, an anaerobic digestion pool and an aeration pool. The heat-insulation heat-preserving system comprises a heat-insulation heat-preserving plate, a hot water recycle pipe, which are arranged inside or outside the anaerobic digestion pool.    USE - Used as an air-energy, solar energy and ground source heat pump biogas pool.    ADVANTAGE - The biogas pool: provides both hot water and cool air when generating the biogas, is economical, and consumes less energy during biogas production.    DETAILED DESCRIPTION - Air-energy, solar energy and ground source heat pump biogas pool comprises: an anaerobic digestion system, a heat-insulation heat-preserving system, a solar water heating system, an air-energy heat pump system, a ground source heat pump system and a control system. The anaerobic digestion system comprises a pre-processing pool, a sludge pool, an anaerobic digestion pool and an aeration pool. The heat-insulation heat-preserving system comprises a heat-insulation heat-preserving plate, a hot water recycle pipe, a recycle pipe and a hot water transfer box. The solar water heating system comprises a heat collector, a water tank, a hot water pipeline and a recycle pump. The air-energy heat pump system comprises an evaporator, a compressor, a throttling device and a gas-liquid platy heat exchanger. The ground-source heat pump system comprises an underground heat exchanging system, a heat pump main/auxiliary machine system and a tail-end heat exchanging device. The underground heat exchanging system comprises a buried pipe heat exchanger, a recycle water pump and a pipeline. The heat pump main/auxiliary machine system comprises a cold/hot source heat exchanger, a compressor, a reversing valve and a throttling valve. The tail-end heat exchanging device of ground-source heat pump system, the solar hot water pipeline and the air-energy heat pump system are connected to the heat-insulation heat-preserving system and the anaerobic digestion system through the hot water recycle pipe. The buried pipe heat exchanger in the ground-source heat pump is the vertical buried pipe heat exchanger. The water accelerates the anaerobic digestion by heating the anaerobic digestion pool through the recycle pipe. The anaerobic digestion pool is heated by the ground-source heat pump system, air-energy heat pump system and the solar water heating system after the hot water is cooled. The hot water recycle pipe is arranged inside or outside the anaerobic digestion pool.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the air-energy, solar energy and ground source heat pump biogas pool.