NOVELTY - An accumulation treatment device of methane in ventilation air methane comprises a separating and absorbing containers connected by an electromagnetic valve and connected with air inlet of a recycling air system filled with molecular sieve absorbing agent; and a methane storage device comprising separated methane temporary storage container and accumulated methane storage container connected via a methane pressurizing conveyor.    USE - An accumulation treatment device of methane in ventilation air methane.    ADVANTAGE - The accumulation treatment device has reasonable design; is stable during operation; has good controllability and compactness, reduces floor space, investment cost and methane usage; and emits clean ventilated gas.    DETAILED DESCRIPTION - An accumulation treatment device of methane in ventilation air methane comprises:    (1) a separating and absorbing containers connected by an electromagnetic valve and connected with air inlet of a recycling air system filled with molecular sieve absorbing agent;    (2) a methane storage device comprising separated methane temporary storage container and accumulated methane storage container connected via a methane pressurizing conveyor;    (3) a methane accumulating treatment control devices;    (4) a ventilation air methane filter comprising a ventilation air methane flow rate sensor, a ventilation air methane source pressure adjusting valve, a ventilation air methane pressure sensor, a ventilation air methane concentration sensor, a ventilation air methane humidity sensor and a ventilation air methane temperature sensor;    (5) a ventilation air methane booster pump;    (6) a ventilation air methane drying pre-treatment device comprising a temperature sensor and a humidity sensor; and    (7) a ventilation air methane pressure balance device comprising a pressure sensor.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of an accumulation treatment device of methane in ventilation air methane.