NOVELTY - One-piece cryogenic adsorption ultra-pure hydrogen production unit comprises a vacuum insulating Dewar flask (1), a cryogenic adsorber (4) and three-flow heat exchanger coil (5), where the cryogenic adsorber and the three-flow heat exchanger coil are set in a vacuum adiabatic Dewar flask. The three-flow heat exchanger coil is located on upper part of the cryogenic adsorber. The coil structure of the three-flow heat exchanger coil is set with a coil cover (7), coil core tube and casing on the outside. An interlayer cavity is set between the casing and the core tube.    USE - Used as an one-piece cryogenic adsorption ultra-pure hydrogen production unit.    ADVANTAGE - The device consumes less energy, has compact structure, and is operated under any pressure according to working condition, in a simple manner.    DETAILED DESCRIPTION - One-piece cryogenic adsorption ultra-pure hydrogen production unit comprises a vacuum insulating Dewar flask (1), a cryogenic adsorber (4) and three-flow heat exchanger coil (5), where the cryogenic adsorber and the three-flow heat exchanger coil are set in a vacuum adiabatic Dewar flask. The three-flow heat exchanger coil is located on upper part of the cryogenic adsorber. The coil structure of the three-flow heat exchanger coil is set with a coil cover (7), coil core tube and casing on the outside. An interlayer cavity is set between the casing and the core tube. The upper end of the interlayer cavity is connected to the material inlet tube. The core tube is connected to the outlet pipe; the lower end of the interlayer cavity is connected to the lower end of cryogenic adsorber inlet via connecting pipe and pre-cooling coil; and the upper end of the core tube is connected to the cryogenic adsorber outlet. The coil cover is connected to the upper end of the vent pipe. The vacuum adiabatic Dewar flask is provided with a nitrogen inlet and outlet tubes.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the one-piece cryogenic adsorption ultra-pure hydrogen production unit.    Vacuum insulating Dewar flask (1)    Absorption-regeneration electric heater (3)    Cryogenic adsorber (4)    Three-flow heat exchanger coil (5)    Coil cover (7)