Catalytic cracking catalyst capable of improving coke selectivity and preparation method of catalytic cracking catalyst

The invention provides a catalytic cracking catalyst capable of improving the coke selectivity and a preparation method of the catalytic cracking catalyst. The catalyst is prepared from 15 to 70 weight percent of a molecular sieve, 15 to 60 weight percent of clay, 8 to 30 weight percent of pseudo-boehmite, 3 to 20 weight percent of a binding agent, 0.01 to 10 weight percent of phosphorus (based onP) and 0.01 to 5 weight percent of magnesium (based on Mg). The preparation method of the catalytic cracking catalyst comprises the following steps: mixing the molecular sieve, a pore-expanding agent, the clay, the pseudo-boehmite, a phosphorus-containing compound and the binding agent and pulping; spraying and molding; roasting a molded catalyst microsphere, and mixing with magnesium-containingcompound, ammonium salt and water and pulping; adjusting the pH (Potential of Hydrogen) value and raising the temperature and stirring; filtering and drying to obtain the catalytic cracking catalyst.Under the condition that the conversion ratio is improved and the content of heavy oil is reduced, the catalyst prepared by the method has more excellent coke selectivity.