A dehydrogenation reaction apparatus is disclosed. An embodiment of the present disclosure provides a dehydrogenation reaction apparatus, including: a dehydrogenation reactor that includes a reaction vessel configured to store a chemical hydride, and at least one partition wall partitioning an inner space of the reaction vessel into a plurality of reaction chambers; and a buffer tank configured to temporarily store hydrogen generated in the dehydrogenation reactor and then supply the hydrogen to the fuel cell.