During the operation of the injection molding machine, the heating ring dissipates most of its heat directly into the air while heating the melt cylinder. Some heat energy is carried away by the exhaust gas, which is then released directly into the atmosphere, causing both environmental pollution and significant heat energy loss. This also leads to low thermal efficiency and high equipment wear. The exhaust gas from the injection molding machine is treated using low-temperature plasma purification and UV photo-oxygenation exhaust gas treatment.