NOVELTY - Coal mine ventilation air methane enriching device with adsorption tower exhaust end pump drainage process comprises e.g. an air blower (1), a gas inflow buffer tank (2), a first gas inflow control valve, a second gas inflow control valve, a first vacuumizing control valve, a second vacuumizing control valve, a first discharged gas control valve, a second discharged gas control valve, a first uniform-pressure control valve, a second uniform-pressure control valve, a first pump drainage control valve (8), a second pump drainage control valve and a third pump drainage control valve.    USE - The device is useful for enriching methane, and enriching and concentrating strongly absorbed gas fractions containing methane, carbon dioxide and carbon monoxide.    DETAILED DESCRIPTION - Coal mine ventilation air methane enriching device with adsorption tower exhaust end pump drainage process comprises an air blower (1), a gas inflow buffer tank (2), a first gas inflow control valve, a second gas inflow control valve, a first vacuumizing control valve, a second vacuumizing control valve, a first discharged gas control valve, a second discharged gas control valve, a first uniform-pressure control valve, a second uniform-pressure control valve, a first pump drainage control valve (8), a second pump drainage control valve, a third pump drainage control valve, a one-way valve (9), a discharged gas buffer tank (10), a discharged gas flow regulation valve, a vacuum pump and an adsorption tower. The adsorption tower comprises a first adsorption tower and a second adsorption tower. The air blower is connected to the lower end of the first adsorption tower and the second adsorption tower through the first gas inflow control valve and the second gas inflow control valve through the gas inflow buffer tank. The first adsorption tower is connected to the vacuum pump through the first vacuumizing control valve. The second adsorption tower is connected to the vacuum pump through the second vacuumizing control valve. The one end each of the first adsorption tower and the first pump drainage control valve is connected to the first uniform-pressure control valve and the second uniform pressure control valve, and the other end is connected to the vacuum pump to realize vacuumizing of the adsorption tower exhaust end. The second pump drainage control valve is connected to the vacuum pump exhaust end and the air blower inlet. The one end of the third pump drainage control valve is connected to the vacuum pump, and the other end is used as an output end of the product gas. The one end of the first discharged gas control valve and the second discharged gas control valve are connected to the upper end of the first adsorption tower and the second adsorption tower, and the other end is connected to the discharged gas buffer tank and the discharged gas flow regulation valve through the one-way valve.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the coal mine ventilation air methane enriching device with adsorption tower exhaust end pump drainage process.    Air blower (1)    Gas inflow buffer tank (2)    First pump drainage control valve (8)    One-way valve (9)    Discharged gas buffer tank (10)