A preparation method of a hydrocracking catalyst, comprising the following Steps: 1) mixing pseudo-boehmite, amorphous silicon-alumina and a molecular sieve, adding acid solution, kneading for 2-60 min, and then extruding and molding into stripes; the strips are prepared by drying and calcinating to obtain an inorganic carrier; 2) adding a modification reagent to the inorganic carrier obtained after calcination in step 1) and reacting at 10-120 °C, thereby connecting new functional groups on the surface of the inorganic carrier to obtain a surface-modified inorganic carrier; wherein the amount of the modification reagent is 0.5-20% of the weight of the inorganic carrier obtained after calcination in step 1); 3) loading the VIB metal elements and the VIIIB metal elements on the surface-modified inorganic carrier, obtained in Step 2), by using an impregnation method, and then fully drying at 60-120 °C to obtain the hydrocracking catalyst; the modification reagent in Step 2) contains two or more functional groups; one of the functional group needs to be able to react with the surface of the inorganic carrier, and the other functional group needs to be able to react with oxides or salts containing VIB metal elements or VIIB metal elements; the functional group which is able to react with the surface of the inorganic carrier includes any one of a carboxyl group, anhydride, a halogen substituent, a siloxy group, a phosphate group, a metaphosphate group, and a phosphite group; the functional group which is able to react with oxides or salts containing VIB metal elements or VIIB metal elements include any one of a carboxyl group, a sulfhydryl group, an amide group, and a halogen substituent; wherein the ratio of the weight of the pseudo-boehmite to the weight of the amorphous silica alumina to the weight of the molecular sieve used in Step 1) is::; wherein the amount of the acid solution used in Step 1) is 0.5-10% of the total weight of the pseudo-boehmite, the amorphous silica alumina and the molecular sieve, and the concentration of the acid solution is no more than 10wt%; wherein the acid solution is an inorganic acid or an organic acids. 1) mixing pseudo-boehmite, amorphous silicon-alumina and a molecular sieve, adding acid solution, kneading for 2-60 min, and then extruding and molding into stripes; the strips are prepared by drying and calcinating to obtain an inorganic carrier; 2) adding a modification reagent to the inorganic carrier obtained after calcination in step 1) and reacting at 10-120 °C, thereby connecting new functional groups on the surface of the inorganic carrier to obtain a surface-modified inorganic carrier; wherein the amount of the modification reagent is 0.5-20% of the weight of the inorganic carrier obtained after calcination in step 1); 3) loading the VIB metal elements and the VIIIB metal elements on the surface-modified inorganic carrier, obtained in Step 2), by using an impregnation method, and then fully drying at 60-120 °C to obtain the hydrocracking catalyst; the modification reagent in Step 2) contains two or more functional groups; one of the functional group needs to be able to react with the surface of the inorganic carrier, and the other functional group needs to be able to react with oxides or salts containing VIB metal elements or VIIB metal elements; the functional group which is able to react with the surface of the inorganic carrier includes any one of a carboxyl group, anhydride, a halogen substituent, a siloxy group, a phosphate group, a metaphosphate group, and a phosphite group; the functional group which is able to react with oxides or salts containing VIB metal elements or VIIB metal elements include any one of a carboxyl group, a sulfhydryl group, an amide group, and a halogen substituent; wherein the ratio of the weight of the pseudo-boehmite to the weight of the amorphous silica alumina to the weight of the molecular sieve used in Step 1) is::; wherein the amount of the acid solution used in Step 1) is 0.5-10% of the total weight of the pseudo-boehmite, the amorphous silica alumina and the molecular sieve, and the concentration of the acid solution is no more than 10wt%; wherein the acid solution is an inorganic acid or an organic acids.