Method for preparing hydrodemetallization catalyst

The invention discloses a method for preparing hydrodemetallization catalyst. The method comprises the following steps: 1) partial active ingredient impregnation liquid is used for impregnating to ammonium aluminum carbonate hydroxide powder to obtain the active ingredient-modified ammonium aluminum carbonate hydroxide, then ammonium aluminum carbonate hydroxide is dried for standby; 2) the material obtained in the step 1), pseudo-boehmite dry glue powder, a chemical pore-expanding agent, an extrusion aid, and a peptizing agent are shaped, striped, dried, and calcinated to obtain an alumina carrier; and 3) the alumina carrier obtained is loaded with residual active ingredient, is dried, and calcinated to obtain the hydrodemetallization catalyst. The content of the prepared catalyst active metal is high at a macroporous place, and is low at a porous place, and the catalyst has wide application prospect in hydrodemetallization of heavy oil and residual oil.