Disclosed is an apparatus for manufacturing hydrogen. An apparatus for manufacturing hydrogen according to one embodiment of the present invention comprises: a compressor which compresses a raw gas with high pressure: and a heat exchanging unit which exchanges heat with the raw gas which is supplied to the reformer while having variable inner volume depending on a pressure fluctuation of the syngas when being input in a high-pressure syngas state after a natural gas passing through the compressor passes through a desulfurizer and a reformer.
