Digital accuracy analysis is an important means to ensure the accuracy of machine tool design. Precision modeling and precision analysis are important for geometric accuracy, kinematic accuracy and workpiece surface forming accuracy. At present, there is no exact correspondence between the precision design standard and the machining precision of the workpiece for complex forming movement machine tools. Therefore, a design scheme of machine tool precision based on error prediction is proposed, which is divided into two stages of digital precision analysis. In the first stage, the precision distribution and testing from the workpiece to the parts of the process system were realized through the technical system, and the output precision of the machine tool could be reached under the prescribed precision. In the second stage, the machine tool system was used to complete the precision allocation and inspection of the components of the machine tool. Taking YK3610 gear hobbing machine as an example, the error model of the two systems and its application method were analyzed in detail. The actual cutting accuracy of the machine tool can reach 5-4-4 grade by experiment. Therefore, this method provides reliable guidance for precision design of complex forming movement machine tool.