The invention discloses a catalyst for aromatization and quality modification of FCC (fluid catalytic cracking) gasoline. The catalyst is obtained by modifying stepped hole ZSM-5 by solid-phase crystallization of a molecular sieve by taking solid silica gel or kieselguhr as a silicon source. The modification process comprises the following steps: firstly, carrying out surface silicon coating modification on the molecular sieve by adopting silicon oil with certain molecular weight, then depositing a certain amount of metal ions on the inner surface of the molecular sieve by a dipping method, and compounding the modified molecular sieve with the silicon-coated outer surface and metal-deposited inner surface with a certain amount of aluminum oxide and silicon oxide, thereby obtaining the catalyst provided by the invention. Because the adopted molecular sieve has a smooth mesoporous structure, and is subjected to outer-surface silicon coating modification and inner-surface metal modification, the catalyst provided by the invention has the properties of good aromatization performance and high carbon deposit resistant capability, and is especially suitable for production of clean gasoline with high fluid yield in a modification process of the catalytic gasoline.