Gas recovery device

The utility model provides a gas recovery device, relates to the technical field of organic solid waste treatment, and is used for solving the technical problems that resources are wasted and the environment is influenced due to the fact that carbon dioxide generated by converting humus through biological aerobic fermentation of organic solid waste is directly discharged into the atmosphere. The gas recovery device provided by the utility model comprises photocatalyst equipment, low-temperature plasma equipment, neutralization equipment, washing equipment and a recovery tank, a gas inlet of the photocatalyst equipment is communicated with a gas outlet of the biological fermentation tank, and a gas outlet of the photocatalyst equipment is communicated with a gas inlet of the low-temperature plasma; a gas inlet of the neutralization equipment is communicated with a gas outlet of the low-temperature plasma reaction equipment, and a gas outlet of the neutralization equipment is communicated with a gas inlet of th