An object of the present invention is to provide an exhaust gas treatment system that effectively use heat recovered from an exhaust gas without any limitation in a CO2 chemical absorption equipment that requires enormous heat energy, and thus enabling reduction in running cost of the CO2 chemical absorption equipment. Disclosed is an exhaust gas treatment system with a CO2 chemical absorption equipment, which is provided with a heat recovery device that recovers exhaust heat from an exhaust gas discharged from a boiler; and a CO2 chemical absorption equipment that absorbs CO2 in the exhaust gas by bringing the exhaust gas into contact with an amine absorbing solution in a carbon dioxide (CO2) absorption column, heats the absorbing solution that have absorbed CO2 thereby releasing CO2 into a CO2 regeneration column, heats the absorbing solution after release of CO2 via a reboiler, and then circulates the absorbing solution in a CO2 absorption column; the exhaust gas treatment system comprising a heat exchange unit that applies heat recovered by the heat recovery device to the absorbing solution that is delivered to the reboiler from the CO2 regeneration column of the CO2 chemical absorption equipment.