An olefin polymerization supported metallocene catalyst and its preparation method

The invention discloses a loaded metallocene catalyst, comprising an inorganic carrier, a metal oxide, a metallocene compound and an auxiliary catalyst thereof. The metal oxide is added into the inorganic carrier for doping the carrier, and after being uniformly dispersed, the carrier is treated under certain temperature; the doped inorganic carrier reacts with the auxiliary catalyst and an organic solvent of the metallocene catalyst; and finally, the loaded metallocene catalyst is obtained. Since the metal compound is added for modifying the inorganic carrier, so that the space steric hindrance is reduced, so that the polymerization activity of the metallocene catalyst is obviously improved; and in the prepared catalyst, the fluidity is good and the olefin polymer with better form can beobtained.