Preparation method for alumina carrier

The invention relates to a preparation method for an alumina carrier. The method comprises the following steps of: performing merging, oscillation and neutralization process on an acidic aluminum salt solution and alkali aluminum salt (or alkali precipitating agent), adding a stabilizing agent in an amount which is 0.1 to 3 percent of Al2O3 dry colloid in the ageing process, filtering, washing, forming, drying and roasting, and thus obtaining the alumina carrier. According to the process, the required alumina particle diameter is prepared by merging and oscillation, and then the stabilizing agent is added in the ageing process, so that the stability of colloidal particles can be improved, the particle aggregation degree of the ageing process is reduced, the crystallization degree of the colloidal particles is increased, amorphous alumina is reduced, the particle diameter of the alumina crystal is relatively uniform, the aperture is more centralized, and the specific surface area is enlarged. The method is simple in process; and the prepared alumina carrier with large aperture and high specific surface area can be used as a hydro-treating catalyst carrier, and is particularly suitable to be used as a carrier of a residuum hydro-treating catalyst.