The invention discloses a cobalt-doped modified vanadium phosphorus oxide supported type catalyst for catalyzing and oxidizing NO and a preparation method thereof, and belongs to the technical field of atmospheric pollution regulation. The catalyst takes TiO2 with a great specific surface area as a carrier and isfor supported withing Co-doped modified vanadium phosphorus oxide, and is prepared through the following method: firstly, roasting TiO2 with great specific surface area to obtain the carrier; taking ammonium metavanadate as a vanadium source, roasting, adding ammonium metavanadate intomixed organic substances of a reducing agent isobutanol and a solvent benzyl alcohol, heating and reflowing; adding phosphoric acid and cobalt nitrate in proportion, heating, reflowing, performing suction filtration, and roasting to prepare a VPO-Co active component; and finally, adding the carrier and VPO-Co active ingredient into distilled water in certain proportion to mix, and performing water-bath evaporation, drying, heating, roasting and grinding to obtain the catalyst. The catalyst prepared by the preparation method has relatively high activity for catalyzing and oxidizing NO, and hasrelatively strong SO2 and H2O steam poison resistance.