Industrial marsh gas production device for improving productivity of marsh gas in mode of removing O2, adding CO2 and injecting H2

The invention provides an industrial marsh gas production device for improving productivity of marsh gas in the mode of removing O2, adding CO2 and injecting H2. The industrial marsh gas production device comprises a marsh gas tank, an O2-removing water tower, a CO2-adding tower, a material pool, an H2 injecting port and a slag pool, and is characterized in that O2 removal and CO2 adding are carried out in the O2-removing water tower and the CO2-adding tower respectively through water for reaction, and after raw materials are soaked and stirred evenly in the material pool, H2 is injected into the marsh gas tank in a pressurized mode. Compared with the prior art, the content of O2 in the marsh gas tank is lower, the concentration of CO2 is higher, decomposers and methane bacteria are more active, nutrients needed by growth and propagation are richer, reaction is more thorough, and the marsh gas is higher in production efficiency and better in quality; particularly, part of hydrocarbon matter is converted into alkene matter due to injection of the H2, gasoline is generated while the marsh gas is generated, and the industrial marsh gas production device for improving the productivity of the marsh gas in the mode of removing the O2, adding the CO2 and injecting the H2 has good application and popularization value.