Indoor backwater heat supply enhancing machine applied to centralized heating

An indoor water return heat supply enhancing machine applied to centralized heating comprises a water supply pipeline, a water return pipeline, a heating tail end and a water source heat pump heating unit, the heating tail end comprises a water collecting and distributing device and at least one sub heating tail end, and the water supply pipeline and the water return pipeline are communicated with the water inlet end and the water return end of the heating tail end respectively. A water heat exchanger part of the water side heat exchanger is connected in series or in parallel to a pipeline at the water return end of the heating tail end; or the heating tail end comprises a plurality of sub-heating tail ends, the sub-heating tail ends are communicated with the water supply pipeline and the water return pipeline respectively, the water heat exchanger part is connected to the water return pipeline in series or in parallel, and one sub-heating tail end and one water source heat pump heating unit form one group. A