The utility model discloses a marsh gas purification processing system, including the gas storage holder that is used for saving marsh gas material gas, the gas storage holder passes through the fan to be connected with the separator, and the top export of separator is connected with the iron oxide desulfurizing tower through the pipeline, and the top export of iron oxide desulfurizing tower is connected with the desiliconization tower through the pipeline, the export of desiliconization tower has connected gradually coarse filter and the cold machine of doing of ordinary pressure through the pipeline, and export that the ordinary pressure is cold did the machine is through the pipeline connection filter that admits air, and the exit end of the filter that admits air has connected gradually compressor, precision filter, cold machine, super precision filter and the membrane done of purification through the pipeline and has organized. It carries out the preliminary treatment before the feed gas gets into the marsh gas compressor, can reduce to contain hydrogen sulfide, water content and dustiness, avoids compressor and pipeline to corrode, and the purification treatment who reduces the membrane pipe preceding loads, and protection film pipe better lengthens complete equipment's life, and can prolong the life of iron oxide desulfurizer, the equipment flow is simple, and the volume is less.