Separating device of mine ventilation air gas

The utility model relates to a separating device of mine ventilation air gas. The separating device of the mine ventilation air gas comprises a gas pump station used for draining of the mine ventilation air gas, and a gas conveying passageway used for conveying of the gas, wherein the gas pump station is in connection with an input end of a multistage-gas separating device through a gas input passageway, an output end of the multistage-gas separating device is in connection with a gas output passageway, and the multistage-gas separating device comprises more than two gas separating containers which are sequentially connected through gas conveying pipes. According to the separating device of the mine ventilation air gas, multistage separation and purification of the gas are achieved through a physical separating method, the purpose of effective concentration improvement of the gas is achieved, and therefore a great number of gas energy sources are recycled and utilized, the severe waste of the gas energy sourc