The invention relates to a method for improving the performance of a methanol synthesis catalyst. The method comprises the following steps: settling a carrier by a step-by-step method, adding an auxiliary agent into a carrier settling agent, preparing a carrier precursor, and then continuously settling the precursor to obtain a high-performance carrier. Compared with a catalyst prepared by a conventional method, the methanol synthesis catalyst prepared by the method disclosed by the invention has the advantages that the carrier is settled by the step-by-step method, and the added auxiliary agent can improve the dispersivity and interaction of Cu and Zn, so that the activity and thermal stability of the catalyst are improved, and the market competitiveness of the catalyst can be effectively enhanced.