The invention relates to the field of exhaust treatment and relates to a three-phase catalytic deodorization process for RTO emission exhaust. The method is as follows: gas obtained after RTO is burn passes through a flue gas cooling tower and a three-phase catalytic deodorization device to achieve the effect of purifying the exhaust, wherein the flue gas cooling tower can be used for reducing the temperature of the gas while removing acid gas in the exhaust so as to ensure that subsequent devices can continuously and stably operate. The three-phase catalytic deodorization device is used for performing coupling catalysis gas, liquid, solid phases to degrade odor matters in the exhaust to achieve deodorization effect. The method has the advantages of being easy to operate, low in processing cost, small in device investment, and the like.