The invention provides a treatment system for waste gases. The system comprises an air conveying pipe and a main air pipe, a light quantum purifier, a photo-oxygen catalysis device, a low-temperaturecorona plasma waste-gas treatment device and an exhaust fan which are arranged in sequence along the flow direction of the waste gases; the main air pipe is connected with the light quantum purifier through the air conveying pipe, an outlet of the light quantum purifier is connected with an inlet of the photo-oxygen catalysis device through the air conveying pipe, and an outlet of the photo-oxygencatalysis device is connected with the low-temperature corona plasma waste-gas treatment device through the air conveying pipe; and the front of the main air pipe is provided with a dust collecting box and a cooling box which are arranged in sequence along the flow direction of the waste gases, the interior of the dust collecting box is provided with a dust collecting cavity, the inner bottom surface of the dust collecting cavity is provided with a dust collecting tank, and the rear part of the dust collecting cavity is provided with a filter net. The system provided by the invention purifiesthe waste gases for three times, the purifying effect is remarkable, no odor exists in final discharged gases, and the air quality in the surrounding environment is effectively improved; and the system has a simple structure and a fast waste-gas treatment speed, and is suitable for promotion and use.