Preparation method of supported metal type molecular sieve catalyst

The invention discloses a preparation method of a supported metal type molecular sieve catalyst, the catalyst is expressed as M/ZSM-5-coated Silicalite-1, M represents metal, the inner layer area of the catalyst is a ZSM-5 silicon-aluminum molecular sieve with an MFI topological structure, the M metal is supported on the outer layer of the inner layer area, and the outer layer is coated with a layer of Silicalite-1 all-silicon molecular sieve with the same MFI topological structure. According to the catalyst prepared by the method, the Silicalite-1 neutral skeleton on the outer layer provides a channel for a substrate or metal to freely enter and exit, and the ZSM-5 anion skeleton on the inner layer provides an electron-rich center for stabilizing metal and re-adsorbing metal. The supported metal molecular sieve catalyst prepared by the method provided by the invention can effectively utilize catalytic selectivity brought by molecular sieve micropore properties without sacrificing the catalytic activity of th