Catalytic oxidation system

The utility model provides a catalytic oxidation system which comprises a heat exchange unit, a preheating unit, a catalytic oxidation unit and a safety auxiliary unit, the preheating unit and the catalytic oxidation unit are located in the same device box body, and the front end and the tail end of the device box body are provided with an air inlet and an air outlet respectively. The heat exchange unit is respectively connected with the preheating unit and the catalytic oxidation unit, and the catalytic oxidation unit comprises at least two catalytic bed layers for filling a catalyst. According to the embodiment of the utility model, multiple stages of catalytic bed layers are arranged in the catalytic oxidation unit, so that waste gas is oxidized in the catalytic oxidation unit in a graded manner, VOCs in the waste gas are controlled to oxidize and release heat in a single-layer catalytic bed layer, the catalyst activity is prevented from being reduced due to sharp temperature rise of the catalytic bed laye