NOVELTY - Device comprise a pressure reducing valve (1), whose one end is hermetically connected with a mixed tail gas tube (15), and the other end is connected with one end of a dryer (3). The other end of the dryer is hermetically connected with the inlet (a) of a primary heat exchanger (7). An outlet (a1) connected with the inlet (a) of the primary heat exchanger is hermetically connected with the inlet (w) of a liquefier through a secondary heat exchanger (14). An outlet (w1) connected with the inlet (w) of the liquefier is hermetically connected with the inlet of a gas-solid separator.    USE - The device is useful for recycling gaseous methane from hydrogen tail gas by gas membrane method.    ADVANTAGE - The device has simple structure, high efficiency, waste utilization and energy saving properties and exhaust reduction.    DETAILED DESCRIPTION - Device comprise a pressure reducing valve (1), whose one end is hermetically connected with a mixed tail gas tube (15), and the other end is hermetically connected with one end of a dryer (3), where the other end of the dryer is hermetically connected with the inlet (a) of a primary heat exchanger (7). An outlet (a1) connected with the inlet (a) of the primary heat exchanger is hermetically connected with the inlet (w) of a liquefier through a secondary heat exchanger (14) fixed at the bottom of a rectifying tower. An outlet (w1) connected with the inlet (w) of the liquefier is hermetically connected with the inlet of a gas-solid separator, whose top outlet is hermetically connected with the inlet (c) of the primary heat exchanger. An outlet (c1) connected with the inlet (c) of the primary heat exchanger is hermetically connected with a hydrogen tube. The bottom outlet of the gas-solid separator is hermetically connected with the inlet of the rectifying tower, whose top outlet (m) is hermetically connected with the inlet (v) of the liquefier. An outlet (v1) connected with the inlet (v) of the liquefier is connected with the inlet (e) of the primary heat exchanger. An outlet (e1) connected with the inlet (e) of the primary heat exchanger is hermetically connected with the inlet (x) of a condenser through a low-pressure expansion machine. An outlet (x1) connected with the inlet (x) of the condenser is hermetically connected with the inlet (u) of the liquefier. An outlet (u1) connected with the inlet (u) of the liquefier is hermetically connected with the inlet (d) of the primary heat exchanger. An outlet (d1) connected with the inlet (d) of the primary heat exchanger is connected with a nitrogen and argon evacuation tube. The top outlet of the rectifying tower is hermetically connected with the inlet (y) of the condenser; and outlet (y1) connected with the inlet (y) of the condenser is hermetically connected with the top outlet (m) of the rectifying tower. The bottom outlet of the rectifying tower is hermetically connected with the inlet (b) of the primary heat exchanger. An outlet (b1) connected with the inlet (b) of the primary heat exchanger is hermetically connected with the methane storage tube.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for recycling gaseous methane.    Pressure reducing valve (1)    Dryer (3)    Primary heat exchanger (7)    Secondary heat exchanger (14)    Mixed tail gas tube (15)