The present invention relates to an apparatus for desulfurization/denitrification of polluted gas provided with a separate hydroxyl generation unit, in which the polluted gas contains sulfur and nitrogen compounds. The apparatus of the present invention includes: a reactor for passage of the polluted gas； a remote hydroxyl group generation unit which has a sealed structure with an inner space being blocked from the outside, is separated from the reactor, supplies air and moisture to the inner space, has an ultraviolet ray generation unit generating a vacuum ultraviolet ray, decomposes an oxygen molecule contained in the injected air into an oxygen radical by the generated ultraviolet ray, and generates and the oxygen radical obtained from the decomposition subject to binding with a water molecule contained in the injected water to generate a hydroxyl as an OH radical； and a hydroxyl injection unit which connects the reactor to the remote hydroxyl generation unit and injects into the reactor the hydroxyl generated by the remote hydroxyl generation unit. The hydroxyl injected from the reactor collects anglesite- and nitrate- structure particles generated through desulfurization and denitrification reactions with respect to the polluted gas. According to the present invention, a reduction in OH radical generation efficiency which is attributable to dust or pollutants contained in the polluted gas and adhering to a microwave generation unit or the ultraviolet ray generation unit can be forestalled and denitrification/desulfurization reaction efficiency with respect to the polluted gas is maximized, and thus the polluted gas can be treated in an efficient manner.본 발명은 황 화합물과 질소 화합물이 포함된 오염가스에 대한 탈황 탈질 장치로서, 상기 오염가스가 통과되는 반응로； 내부공간이 외부와 차단된 밀폐 구조로서 상기 반응로와 격리되어 설치되고, 상기 내부공간에 공기와 수분이 공급되며, 진공 자외선을 발생하는 자외선 발생부를 포함하고, 상기 발생된 자외선에 의해 상기 주입된 공기에 포함된 산소분자가 산소 라디칼로 분해되며, 상기 분해된 산소 라디칼과 상기 주입된 수분에 포함된 물분자가 결합하여 OH 라디칼인 수산기를 발생시키는 리모트 수산기 발생부； 상기 반응로와 리모트 수산기 발생부를 연결하고, 상기 리모트 수
