The invention relates to the field of alumina carriers, particularly to an alumina carrier preparation method, which comprises: (1) sequentially crystallizing, neutralizing and aging an aluminum saltand an aluminate in water, and carrying out solid-liquid separation on the aged product; (2) washing the solid phase obtained through the solid-liquid separation, and mixing the washed solid phase, anauxiliary extrusion agent, a diluent and a binder, wherein the diluent is water, and the binder is a thermoplastic resin containing a carboxylic acid group; and (3) carrying out solid-liquid separation on the product obtained in the step (2), drying, and calcining. According to the present invention, with the method, the alumina carrier capable of meeting the performance requirements can be prepared by replacing the dry mixing with the wet mixing without the dry glue powder preparation; and the method has advantages of energy saving, environmental protection and low cost, and is suitable forindustrial application.