The geometric accuracy of machine tool turntable has a great influence on the machining accuracy of parts. For the angle error and eccentricity error produced by the turntable in operation, the separation method of turntable error was proposed. By using conventional measuring tools such as the level instrument and angle pendulum instrument, the geometric error of turntable could be detected and corrected quickly to reduce the error of turntable. The positioning errors of the machine tool turntable angle before and after correction were verified by experiments. The results show that the positioning accuracy of the turntable is improved by 23%, which proves that the correction method can be used to effectively improve the geometric accuracy of the machine tool turntable, and it is easy to operate, low cost.