The present invention is to provide a system for producing hydrogen gas, comprising: an electrolyte solution supply system, an electrolyzer, a hydrogen gas purification system, and a hydrogen gas compression and drying system. Wherein the electrolyte solution supply system operable to supply the electrolyte solution; the electrolyzer operable to perform the electrolysis creates hydrogen gas and oxygen gas; the hydrogen gas purification system operable to the purification of hydrogen gas; and the hydrogen gas compression and drying system operable to dry and compress hydrogen gas to a pressure of a predetermined value. In addition, the invention also mentions a method for producing hydrogen gas to produce hydrogen gas with a purity of more than 99.8%.
