Hydroisomerization/cracking catalyst, and preparation method and application thereof

The invention discloses a hydroisomerization/cracking catalyst and a preparation method thereof. The catalyst is composed of an acidic isocraking carrier and a metal active component loaded on the acidic isocraking carrier; the acidic isocraking carrier is composed of a ZSM-22 molecular sieve and an amorphous oxide; and the mass ratio of the acidic isocraking carrier to the metal active component (by metal oxide and/or metal element) is 70-99.9:0.1-30. The preparation method of the catalyst comprises the following steps: 1, mixing the amorphous oxide with the ZSM-22 molecular sieve, carrying out adjusting and kneading molding by using an acid solution, and drying and roasting to obtain the acidic isocraking carrier; and 2, dipping the acidic isocraking carrier in an aqueous solution of a soluble salt of the active metal component, and drying and roasting to obtain the catalyst. The catalyst can crack high-melting-point long-chain normal paraffins into lightweight diesel oil during hydroisomerization, generate