Abstract: Aiming at the problem that the subjective weight is too subjective while the objective weight is too dependent on the sample in the accuracy evaluation of CNC machine tools, a fuzzy evaluation method based on combined weighting is proposed to evaluate the accuracy of CNC machine tools. This method combines the subjective weight based on the order relation analysis method and the objective weight of the entropy value method, and uses the analytic hierarchy process to establish the target weight vector. By establishing the judgment matrix of each evaluation index of machine tool, the comprehensive evaluation result of machine tool accuracy is obtained by fuzzy comprehensive evaluation method. Taking CNC gantry milling machine as an example, the results can provide basis for the selection of CNC machine tools, and can also provide reference for the improvement of machine performance.