The invention relates to the technical field of waste plastic recycling, and discloses a preparation method of a catalyst for catalytic cracking of waste plastics, comprising the following steps: adding a water glass solution to a sulfuric acid solution under vigorous stirring to make the silica concentration reach 3.5%–6%, so as to prepare an acidic silica hydrogel slurry; adjusting the temperature and pH, then aging the slurry to obtain a silica gel structure suitable for serving as a catalyst framework; adding an aluminum sulfate solution to the slurry, depositing aluminum onto the silica hydrogel with ammonia water, filtering the obtained silica hydrogel, washing with a dilute ammonium chloride solution to remove adsorbed sodium, and drying. The preparation process of the invention is simple, and the operation is safe and reliable; the obtained catalyst has high activity, short reaction time, and the oil product after waste plastic cracking has good quality and high yield.

Country Code: CN

Application Number: CN201410250774.X