A system for concentrative warming through extracting temperature with large temperature difference via a heat pump technology comprises original heating equipment. Back water in a heating back waterpipeline of the original heating equipment works as a low-temperature heat source of a heat pump system; hot water can be supplied to a residence terminal system for heating after work of the low-temperature heat pump system; if a community heating system is further increased, back water in the heating back water pipeline of the upper-stage newly-added heating system works as a low-temperature heat pump; heating performance coefficient of the heat pump is increased, so temperature of the back water can be reduced to a lower degree when a present concentrative heat-supply pipe network is remained the same; a back water temperature difference of the whole concentrative heat-supply pipe network can be increased; and heat supplying capacity can be greatly improved when the present pipe networkis remained the same. Compared with a common pipe network re-arrangement way, the scheme requires low cost and short construction period, and is flexible to arranged; huge investment for pipe networkrearrangement can be solved; and problems of traffic jam and troubles to resident life during the construction can be solved.