Marsh gas treating system

The invention discloses a marsh gas treatment system comprising a marsh gas gathering unit, a methane collection unit, a desulphurization unit and a methane purification unit, wherein the desulphurization unit and the methane purification unit are arranged between the marsh gas gathering unit and the methane collection unit and mutually connected in series. The marsh gas treatment system further comprises a carbon dioxide purification unit and a carbon dioxide collection unit, wherein the carbon dioxide purification unit is internally provided with absorbent for separating carbon dioxide and outputting the separated carbon dioxide; and the carbon dioxide purification unit is connected in series with the methane purification unit and arranged between the desulphurization unit and the carbondioxide collection unit. The marsh gas treatment system has the following advantages: (1) the purification of methane and carbon dioxide is realized; (2) the investment cost is lower due to simple devices in the whole system, so that the system is suitable for popularization and application; and (3) the system can be either fixedly mounted or skid-mounted.