A preparation method and an application method of a non-noble metal reforming catalyst. The catalyst comprises a Ni2P active component and a composite carrier. The composite carrier comprises gama-Al2O3 and SAPO-11. The preparation method comprises the following steps: firstly, adding sesbania powder into raw materials of aluminium hydroxide dry gel powder, pseudo-boehmite and SAPO-11, then adding nitric acid aqueous solution, performing kneading, strip extrusion, air drying, drying and roasting to prepare a composite carrier of gama-Al2O3-SAPO-11; secondly, preparing a nickel hypophosphite impregnation liquid at 60-80 DEG C, controlling the molar ratio of phosphorus to nickel, impregnating the composite carrier by constant temperature supersaturation impregnation, performing air drying and vacuum drying to obtain a catalyst precursor; finally, putting the catalyst precursor in a tubular furnace, and roasting in N2 to prepare the Ni2P/gama-Al2O3-SAPO-11 catalyst. Compared with the prior art, the preparation method is simple in process, low in preparation temperature, and mild in reaction conditions; the prepared catalyst is high in dispersity, can be used in naphtha reforming reaction, has high aromatic hydrocarbon yield and activity stability, and is low in price.