PROBLEM TO BE SOLVED: To provide a low cost method for adsorption separation of hydrogen from a steam modified gas and a device therefor.SOLUTION: The invention relates to a compact and highly efficient separation method and device of hydrogen from a steam modified gas containing moisture, hydrogen, carbon monoxide (CO), carbon dioxide (CO) or the like, especially a separation method and device of hydrogen from a steam modified gas having improved hydrogen separation and recovery efficiency by absorbing hydrogen remained in rear of a tower in an absorption process and storing the same, and supplying as a pressure rise gas in a pressure rising process in the next absorption process.SELECTED DRAWING: Figure 1