The utility model discloses a novel building heat preservation system, including the building, set up first heating heat preservation and the second heating heat preservation of setting outside first heating heat preservation in the building masonry wall, first heating heat preservation connect earth source heat pump heating system, second heating heat preservation connect sanitary wastewater waste heat heating system. The utility model discloses set up earth source heat pump heating system and sanitary wastewater waste heat heating system simultaneously, realized double barreled heating heat preservation system, can realize rapid intensification heating, also can carry out the long -term heat preservation of constructing as required. The utility model discloses a sustainable development's clean energy, greatly reduced environmental pollution and the social danger that causes because providing heat source, improved renewable energy's utilization efficiency greatly, reduced the social life cost, accord with the demand for development of country, improved the market competition of enterprise greatly.