This utility model relates to the field of catalytic oxidizer technology, specifically a catalytic oxidizer for diesel vehicle exhaust treatment. It includes a catalytic component, an intake component, and an exhaust component. The catalytic component includes a perforated heat dissipation shell, with the catalytic oxidizer body installed at one end of the shell. The intake component includes an intake manifold, with a preheating box on one side. A heating ring and a temperature sensor are installed inside the preheating box. This utility model preheats the catalytic oxidizer body using the heating ring, accelerating the temperature rise of the catalyst within the oxidizer body to achieve the required activity. This prevents the release of harmful substances during exhaust preheating, improving the completeness of exhaust treatment. The perforated heat dissipation shell isolates and assists in heat dissipation from the catalytic oxidizer body, preventing
heat transfer from the oxidizer body to the vehicle
chassis.