The invention provides a preparation method of a metal ion doped Fe2O3 catalysis material. The preparation method comprises the steps: (1) dissolving ferric iron salt in an alcohol and/or H2O solvent, continuously stirring to achieve uniform dispersion, (2) adding metal salt into dispersing liquid obtained in step (1), continuing to stir to achieve the uniform dispersion, (3) adding CH3COONa into the dispersing liquid, continuing to stir to achieve the uniform dispersion, (4) transferring a mixed solution into a hydrothermal reaction kettle with a liner made of polytetrafluoroethylene, putting in an oven for reaction after package, and (5) naturally cooling to a room temperature and cleaning with water and alcohol.The invention further provides application of the Fe2O3 catalysis material in catalysis of ammonium perchlorate thermolysis reaction.A preparation process of the metal ion doped Fe2O3 nanomaterial is simple in technology and good in repeatability; doping raw materials such as Cu<2+> and Zn<2+> are cheap and easy to obtain; and the material has higher application prospects and use values.