The VOC Concentrator adopts the mode of ‘adsorption-desorption-cooling’ to realise the waste gas treatment. Exhaust gas firstly enters the adsorption area of the rotor, and organic components are adsorbed onto the small holes of the rotor; the adsorption saturated small holes are backblown by small flow rate of hot air to achieve efficient desorption of highly concentrated exhaust gas, and then enters into the back-end of the regenerative heat incineration device for combustion treatment, and the exhaust gas is finally discharged into the atmosphere in the form of carbon dioxide and water vapour to complete the concentration of large-volume, low-consistency organic waste gas; the desorption of the clean The clean adsorption carrier is transferred to the cooling area, cooled to room temperature by air, and continues to enter the adsorption stage, and so on in a continuous cycle of work.