NOVELTY - Treating exhaust gases to produce dicumyl peroxide using a waste gas treatment device comprises: collecting exhaust gases through the collecting tank by condensing and oxidizing the exhaust gases and then discharging; passing the exhaust gases to a bottom of the active carbon absorbing tank through the exhaust fan and carrying out activated carbon adsorption treatment; passing the processed gas from top of the active carbon absorbing tank into steam inlet for steam blowing; and passing purge gas obtained by condensation of mixture of isopropylbenzene and water into the condenser.    USE - The method is useful for treating exhaust gases to produce dicumyl peroxide (claimed).    ADVANTAGE - The method is capable of simply and economically treating the exhaust gases with high efficiency of 95-99% and reduced discharged waste gas thus producing the dicumyl peroxide without secondary pollution.    DETAILED DESCRIPTION - Treating exhaust gases to produce dicumyl peroxide using a waste gas treatment device comprising a collecting tank, an active carbon absorbing tank, a condenser, a separating tank and an exhaust fan, which are connected to a pipeline, comprises: (a) collecting exhaust gases through the collecting tank by condensation of the exhaust gases in a condensation section and then discharging and oxidizing the exhaust gases discharged from the condensation section and then discharging, where the oxidation section has exhaust gas discharge volume of 1000-1500 Nm3/hour and contains organic matter including methanol, isopropyl benzene and nonmethane hydrocarbons, and the condensation section has exhaust gas discharge volume of 1000-2000 Nm3/hour and mainly contains organic matter including methanol, isopropyl benzene, nonmethane hydrocarbons and acetone; (b) passing the exhaust gases to a bottom of the active carbon absorbing tank through the exhaust fan and then carrying out activated carbon adsorption treatment at room temperature and closing the exhaust gas including organic substances comprising isopropyl benzene through the clean gas after the adsorption of high exhaust emissions for more than 15 minutes, where the active carbon absorbing tank comprises a first active carbon absorbing tank and a second active carbon absorbing tank that are used interchangeably, when one of the adsorption tanks is switched to another adsorption treatment; (c) passing the processed gas from a top of the active carbon absorbing tank into steam inlet for steam blowing at 100-150 degrees C and for absorbing the organic matter from the activated carbon fiber and then steam blowing at 40-80 degrees C using hot air from the bottom of the activated carbon absorbing tank and drying; and (d) passing purge gas obtained after condensation of isopropylbenzene and water mixture at temperature of 10-50 degrees C into the condenser and entering the mixed liquid into separating tank and then standing for layering, separating organic phase containing isopropyl-benzene and then recycling, and discharging the separated aqueous phase from the waste gas treatment system.