Method for preparing magnesium chloride loaded metallocene catalyst

The invention discloses a method for preparing a loaded metallocene catalyst by taking magnesium chloride as a carrier, which comprises the following steps of: (1), preparation of a magnesium chloride carrier; (2), preparation of a magnesium chloride carrier of alkyl aluminoxane; and (3), preparation of a magnesium chloride loaded metallocene catalyst, wherein the magnesium chloride carrier is prepared by adopting a spraying method in which etrahydrofuran is taken as a solvent. In the method, preparation of the magnesium chloride carrier is simple; and the obtained loaded catalyst granule has good shape and adjustable size. The obtained loaded metallocene catalyst catalyzes copolymerization of ethylene and high-grade alpha-olefin with high copolymerization activity, and has the excellent granule shape of obtained rein powder materials, and high stacking density; and the loaded metallocene catalyst can be suitable for a slurry packing method and a gas phase polymerization process.