NOVELTY - Regenerating a raw material for a hydrogen supply system of a fuel cell, comprises: reacting aluminum and a metal hydroxide to produce hydrogen in a hydrogen supply system of the fuel cell; recovering an aluminum compound produced simultaneously with the hydrogen in the reacting step; obtaining an aluminum hydroxide from the aluminum compound produced simultaneously with the hydrogen; heat-treating aluminum hydroxide to obtain an aluminum oxide; reducing the aluminum oxide to obtain aluminum; and re-supplying the obtained aluminum as a raw material for producing hydrogen in the reacting step.    USE - The method is useful for regenerating a raw material for a hydrogen supply system of a fuel cell (claimed).    ADVANTAGE - The method can be carried out in cost efficient and environment-friendly manner.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a raw material regeneration system of a hydrogen supply system of a fuel cell, comprising a hydrogen supply part of a fuel cell vehicle for producing hydrogen and an aluminum compound through a reaction of aluminum and a metal hydroxide, and a regenerating part for regenerating the aluminum compound into an aluminum metal by recovering the aluminum compound produced in the hydrogen supply part, where the regenerated aluminum metal is re-supplied as a raw material into the hydrogen supply part of the fuel cell vehicle; and    (2) regenerating a raw material for a hydrogen supply system of a fuel cell, comprising reacting aluminum and an aqueous solution of sodium hydroxide to produce hydrogen in hydrogen supply system of the fuel cell, recovering sodium aluminate liquid produced simultaneously with the hydrogen in the reacting step, precipitating aluminum hydroxide from the recovered sodium aluminate liquid, heat-treating the precipitated aluminum hydroxide to obtain aluminum oxide, reducing the aluminum oxide by an electrolyte reduction to obtain aluminum having a surface coated with aluminum oxide, and re-supplying the obtained aluminum as a raw material for producing hydrogen in the reacting step.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the method for regenerating a raw material for a fuel cell hydrogen supply system (Drawing includes non-English language text).