The invention relates to an N regulated Pt / UiO-67 composite material with high stability as well as a preparation method and application thereof. A carrier of the composite material is N-UiO-67, the composite material has a Zr6O32 secondary structure unit and a molecular formula of [Zr6O4(OH)4(O2C-C12NH6-CO2)6], and the loaded precious metal is Pt. The preparation method comprises the following steps: mixing zirconium chloride and 6-(4-hydroxyphenyl) niacin with DMF, carrying out water heating, filtering, washing and drying, thus obtaining new MOFs N-UiO-67; weighing N-UiO-67 and K2PtCI4, respectively dissolving in the DMF solution in an ultrasonic way, meanwhile, dripping the DMF solution of K2PtCI4 to the N-UiO-67 solution, mixing and carrying out ultrasonic treatment, then transferring to a round-bottom flask and stirring, dripping NaBH4 solution for reduction, stirring, filtering, washing, and drying, thus obtaining the powdery N regulated Pt / UiO-67 composite material. The N regulated Pt / UiO-67 composite particles are uniform in distribution, have particle size of about 2-3 micrometers, have relatively low initiation temperature, have carbon monoxide oxidation susceptibility with high stability, and can be recycled.