Abstract: The present application provides a metal modified ZSM-5 molecular sieve catalyst and a preparation method and an application thereof, and the preparation method includes the following steps: mixing a ZSM-5 molecular sieve, tetraethyl orthosilicate, trichloroacetic acid, and water for reaction, and filtering to obtain an intermediate; mixing the intermediate, a melamine solution and a metal salt solution, drying and roasting, and obtaining the metal modified ZSM-5 molecular sieve catalyst. The prepared catalyst has the advantages of good catalytic activity, selectivity and stability, simple preparation process and easiness for operation.