Preparation method of heavy oil catalytic cracking catalyst

The invention provides a preparation method of a heavy oil catalytic cracking catalyst. A synthesis method comprises the specific steps that kaolin is beaten, and subjected to spray drying to form microspheres, then high-temperature roasting and low-temperature roasting are conducted respectively to obtain roasted kaolin spheres and metakaolin spheres, the roasted kaolin spheres are subjected to alkali treatment and then mixed with a guiding agent and alkali liquor, after hydrothermal crystallization is conducted for a period of time, the metakaolin spheres subjected to acid treatment are added for continuing crystallization, and filtering, washing with water and drying are conducted to obtain NaY molecular sieve microspheres. According to the preparation method, under the situation that the molecular sieve crystallinity degree is not decreased, the utilizing rate of a silicon source is increased without additionally adding the silicon source, the silica-alumina ratio of a molecular sieve is greater than 5.5, a composite material has a good hole structure, and the catalytic cracking catalyst prepared through modification has the good heavy oil conversion capacity.