The present invention relates to a water-gas shift reaction system and a water-gas shift method using a low temperature plasma device and, more specifically, to a water-gas shift reaction system and a water-gas shift method using a low temperature plasma device, wherein the water-gas shift reaction is activated without the use of a catalyst or with little energy in reducing the usage of the catalyst and increasing a yield of high concentration hydrogen. For this, the water-gas shift reaction system which is installed in a chamber comprises a dielectric barrier discharging device which turns steam received via an inlet on the chamber processed with low plasma discharge into steam including H and OH radicals; and the water-gas shift reaction device which generates hydrogen gas by making the steam including H and OH radicals from the dielectric barrier discharging device and carbon monoxide react.
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