NOVELTY - A waste heat utilization system of biogas power generation comprises a heat exchanging assembly comprising an under frame (1), a circulating water pump (2), a cylinder sleeve water heat exchanger (3), a smoke heat exchanger (4), a control box (5), multiple pipelines (6) for connecting, and multiple check valves (7) set in the pipelines; where the heat exchanging assembly is set with the circulating inlet (10) and circulating outlet (20); the outlet is connected with the medium inlet of heat exchanger in the biogas reaction tank; and the medium outlet is connected with the water storage tank.    USE - The waste heat utilization system of biogas power generation is useful for industrial and commercial applications.    ADVANTAGE - In the waste heat utilization system of biogas power generation, the cylinder sleeve water heat exchanger is connected with the smoke heat exchanger in series; where it provides the high temperature water for heat preservation and temperature-increasing of the material of biogas reaction tank. Moreover, the heat exchanging assembly of the waste heat utilization system has compact structure and convenient installation.    DETAILED DESCRIPTION - A waste heat utilization system of biogas power generation comprises a heat exchanging assembly comprising an under frame (1), a circulating water pump (2), a cylinder sleeve water heat exchanger (3), a smoke heat exchanger (4), a control box (5), multiple pipelines (6) for connecting, and multiple check valves (7) set in the pipelines; where the heat exchanging assembly is set with the circulating inlet (10) and circulating outlet (20); the heat exchanging assembly, the heat exchanger in the water storage tank (8) and the heat exchanger in the biogas reaction tank (9) form the water circulating system, which is the circulating water inlet of heat exchanging assembly are connected with the water storage tank; the outlet is connected with the medium inlet of heat exchanger in the biogas reaction tank; and the medium outlet of heat exchanging in the biogas reaction tank is connected with the water storage tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the waste heat utilization system of biogas power generation.    Under frame (1)    Circulating water pump (2)    Cylinder sleeve water heat exchanger (3)    Smoke heat exchanger (4)    Control box (5)    Multiple pipelines (6)    Multiple check valves (7)    Water storage tank (8)    Biogas reaction tank (9)    Circulating inlet (10)    Circulating outlet (20)