The present invention discloses a preparation method of an alumina carrier for a silver catalyst, and the method comprises the following steps: step I, a solid mixture comprising 50-500 mesh A12O3 trihydrate, no-less-than 200 mesh pseudo A12O3 monohydrate, a fluoride mineralizer and nickel or a nickel-containing compound is prepared, and then an acid is added for being kneaded with the solid mixture; and step II, the alumina carrier is obtained by forming, drying and calcining of the material obtained by the step I. According to the method, the obtained alumina carrier has a large specific surface area and a high strength; the silver catalyst made from the alumina carrier exhibits good activity and selectivity in the preparation process of ethylene oxide by ethylene oxidation.