Catalytic cracking catalyst capable of increasing yield of gasoline and preparation method thereof

The invention provides a catalytic cracking catalyst capable of increasing the yield of gasoline and a preparation method thereof. The catalyst is prepared from 15-70 wt% of a molecular sieve, 15-60 wt% of clay, 8-30 wt% of pseudo-boehmite, 3-20 wt% of a binder, 0.01-2 wt% of phosphorus in terms of phosphorus and 0.01-3 wt% of magnesium in terms of magnesium. The preparation method comprises the following steps that (1) a phosphorus and magnesium modified Y type molecular sieve is prepared, specifically, the Y-type molecular sieve and a phosphorus-containing compound are mixed and pulped for reaction, and then a magnesium-containing compound is added for heating reaction; (2) a modified matrix material is prepared, specifically, the clay, the pseudo-boehmite, the binder and water are mixedand pulped, and the phosphorus-containing compound is added for uniform stirring; and (3) the phosphorus and magnesium modified Y type molecular sieve and the modified matrix material are mixed and pulped, and spray drying, washing, filtering and drying are carried out in sequence. The catalyst prepared through the method has strong heavy oil conversion capability and good coke and gasoline selectivity, the preparation process is simple, and industrial production is easy to realize.