Preparation method of silicon group-containing catalytic cracking catalyst

The invention discloses a preparation method of a silicon group-containing catalytic cracking catalyst. The preparation method comprises mixing and beating an Al-based binder, a modified molecular sieve, clay and silica sol, and carrying out spray drying and roasting to obtain the catalyst. The silica sol is acid-modified alkaline silica sol and under acid modification conditions of stirring and a temperature of 0-30 DEG C, an acid is added into the alkaline silica sol and the mixture is uniformly mixed until sol pH is in a range of 1-5 so that the acid-modified alkaline silica sol is obtained. The modified molecular sieve is obtained through non-framework aluminum removal and phosphorus modification and under modification conditions of stirring and a temperature of 0-30 DEG C, an organic acid complexing agent is added into molecular sieve slurry so that non-framework aluminum is removed and a phosphorous compound is added into the molecular sieve slurry for modification. The preparation method realizes base and active component optimization. The catalyst has the advantages of good heavy oil conversion rate, coke selectivity and light oil yield.