The invention relates to a
gaseous substance high-concentration device and an
exhaust gas treatment device for treating the
gaseous substance. The invention provides a
gaseous substance concentration device, which is characterized in that the concentration device is used for concentrating a gaseous substance, and the concentration device comprises: an adsorption part which forms a plurality of functional areas for adsorbing, concentrating and desorbing the gaseous substance in an
exhaust gas; the present invention relates to a concentration device comprising an adsorption member having a plurality of functional regions including an adsorption region, a
desorption region, and a cooling region, and a driving unit for relatively rotating the adsorption member with respect to
exhaust gas, the concentration device comprising: an exhaust gas passage flowing from an exhaust source into the adsorption region; a
desorption gas passage for discharging the concentrated gas from the
desorption region; a cooling gas passage flowing into the cooling region; and a recirculation passage diverted from the desorption gas passage and converging with the cooling gas passage, in which a portion of the concentrated gas of the desorption gas passage flows into the cooling region through the recirculation passage.