Multistage pore structure nano molecular sieve catalyst and preparation method thereof

The invention discloses a multistage pore structure nano molecular sieve catalyst, belonging to the field of materials and catalysts. A preparation method of the catalyst comprises the following steps of: mixing tetraethoxysilane, aluminum isopropoxide and an organic template agent to obtain a molecular sieve original solution; directly adding organosilane into the molecular sieve original solution, and grafting organosilane to a ZSM-5 molecular sieve under condensation and flux conditions; and roasting to remove the organosilane and the organic template agent. The multistage pore structure nano molecular sieve catalyst with micropores and mesopores can be obtained by using the method, contains nano particles with proper nano particle size, has high stability and is applied to macromolecule reactions.