NOVELTY - The system comprises a summer autumn solar hot energy storage arranged to a ground, and a marsh gas winter season heating device connected with small biogas tank, where the small biogas tank is composed of upper solar heat collecting hot water tube, a solar heat collector, a solar heat collector, a solar heat collector circulating pump, a underground heat reservoir solar hot heat exchanger, a factory building, a ground plane, a heat preservation layer, a methane tank and an upper marsh gas tank. The upper marsh gas tank is connected with a methane pool heat exchange circulating pump.    USE - The system is useful for producing seasonal storage solar thermal insulation digester gas (claimed), which is useful as natural gas and marsh gas.    ADVANTAGE - The system is useful for producing seasonal storage solar thermal insulation digester gas with high efficiency in an energy-saving manner.    DETAILED DESCRIPTION - The system comprises a summer autumn solar hot energy storage arranged to a ground, and a marsh gas winter season heating device connected with small biogas tank, where the small biogas tank is composed of upper solar heat collecting hot water tube, a solar heat collector, a solar heat collector, a solar heat collector circulating pump, a underground heat reservoir solar hot heat exchanger, a factory building, a ground plane, a heat preservation layer, a methane tank and an upper marsh gas tank. The upper marsh gas tank is connected with an underground temperature preservation reservoir connecting water tube, a methane pool heat exchange circulating pump, a methane tank to exchange heat with the underground temperature preservation water storage tank connecting water return tube and an underground temperature adjusting disk tube. An upper part of the underground temperature adjusting disk tube is connected with a water tube, a circulating pump, an underground temperature adjusting tower, an underground temperature adjusting return pipe, an upper heat underground tube net and a underground temperature preservation heat reservoir connecting water tube, an underground heat storage tube net circulating pump, a underground heat storage tube net, an underground heat storage tube net and the underground temperature preservation thermal storage tank machinery connecting water return tube. The power supply power wire, an intelligent controller, a solar heat collector temperature sensor connecting wire, a solar heat collector temperature sensor, a solar heat collector circulating pump control connecting line, an underground insulating heat reservoir temperature sensor connecting wire, a marsh gas pool temperature sensor connecting wire, a marsh gas pool heat exchange circulating pump control connecting line, an underground temperature adjusting disk tube temperature sensor connecting wire and an underground temperature adjusting tube circulating pump control connecting line are connected with each other. The underground temperature adjusting tube circulating pump control connecting line is connected with an underground heat storage tube net temperature sensor connecting line through an electric connecting sequence. The factory building is provided with a roof solar heat collecting plate, a sunshine wall surface in steel structure workshop and space. The marsh gas tank is arranged in a ground plane or half-underground. The ground is provided with a lower heat preservation layer. A wall of methane pool is provided with heat exchange tube net. The heat exchange tube is a ring network or upper lower two circular rings. The marsh gas pool wall is composed of an upper vertical pipe lower ring parallel connected to the heat exchange tube. The heat exchange tube net is connected with an underground temperature preservation water storage tank. The methane pool heat exchange circulating pump is connected with a heat exchange tube net. The methane tank is provided with underground temperature preservation water storage tank connecting water return tube via an underground temperature preservation heat reservoir. The marsh gas tank is connected with an underground heat storage, which is provided with the underground temperature adjusting disk tube. The underground temperature adjusting disk tube is composed of a water tube upper underground temperature adjusting disk tube, a temperature-regulating circulator pump, an underground temperature adjusting tower, an underground temperature tower and an underground temperature adjusting return form closed cycle system. A lower part of the marsh gas tank is composed of multiple U-shaped tube type deep buried undergrounds, or base of a whole building, underground heat up tube net and the underground temperature preservation heat reservoir connecting water tube, an underground heat storage tube net circulating pump, the underground heat storage tube net, an underground heat storage tube net and the underground temperature preservation thermal storage tank connecting water return tube, which is connected with a medium in the underground temperature preservation of heat reservoir.