Natural gas reforming hydrogen production release gas recovery device and recovery method

The invention discloses a natural gas reforming hydrogen production release gas recovery device and recovery method and belongs to the field of chemical waste gas recovery. The device comprises an absorption tower, a first heat exchanger, a desorption tower unit and a hydrogen recovery unit, wherein a raw material gas inlet of the absorption tower is connected with a first release gas output pipeline; a first end inlet of the first heat exchanger is connected with a bottom outlet of the absorption tower; the first end of the desorption tower unit is connected with a first end outlet of the first heat exchanger, the second end of the desorption tower unit is connected with a second end inlet of the first heat exchanger, and a second end outlet of the first heat exchanger is connected with atop inlet of the absorption tower; one end of the hydrogen recovery unit is connected with a top outlet of the absorption tower, and the other end is connected with a PSA unit. After decarburizationby the absorption tower, f