A new type of activated carbon (mostly honeycomb carbon or fiber carbon) is used to adsorb concentrated low concentration of organic waste gas. After adsorption is close to saturation, hot air is introduced to heat the activated carbon, so that the organic waste gas is desorbed into the catalytic combustion bed for flameless combustion purification treatment. The hot gas is recycled in the system or a secondary heat exchanger is added for heat recovery. In this method, the low concentration of organic waste gas is concentrated into high concentration organic waste gas by activated carbon and then completely purified by catalytic combustion. This method absorbs the advantages of adsorption method and catalytic combustion method, overcomes the disadvantages of their separate use, and is a mature and practical method for the treatment of organic waste gas in China.