NOVELTY - The marsh gas power generation system comprises a biogas slurry pool (1) and a sand settling tank (2) provided with a feeding opening (3). A side part of the sand settling tank is provided with a secondary depositing pool (4). The sand settling tank and the secondary depositing pool are provided with a grid groove (5). The side part of the secondary depositing pool is connected with a hydrolysis acidification tank connected with an anaerobic fermentation tank through a pipeline. A top part of the anaerobic fermentation tank is connected with an exhaust pipe.    USE - Used as a marsh gas power generation system.    ADVANTAGE - The marsh gas power generation system has simple structure, and improved fermentation efficiency.    DETAILED DESCRIPTION - The marsh gas power generation system comprises a biogas slurry pool (1) and a sand settling tank (2) provided with a feeding opening (3). A side part of the sand settling tank is provided with a secondary depositing pool (4). The sand settling tank and the secondary depositing pool are provided with a grid groove (5). The side part of the secondary depositing pool is connected with a hydrolysis acidification tank connected with an anaerobic fermentation tank through a pipeline. A top part of the anaerobic fermentation tank is connected with an exhaust pipe. The exhaust pipe is connected with a gas water separator and a desulfurizing tower. The water flows into a storage tank through the pipeline. A bottom part of the gas storage tank is connected through the pipeline connected to a marsh gas generator to generate power. A tail end of the exhaust pipe is connected with a fuel gas boiler whose side part is provided with a solar energy heating pipe. The gas boiler and the solar energy heating pipe are connected with a heat supply pipeline. The anaerobic fermentation tank is provided for preheating the heat supply pipeline. The top part of the anaerobic fermentation tank is connected with the biogas slurry pool through the pipeline.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a marsh gas power generation system.    Biogas slurry pool (1)    Sand settling tank (2)    Feeding opening (3)    Secondary depositing pool (4)    Grid groove. (5)