Method for correcting positioning precision deviation of machine tool

The invention provides a correction method for positioning precision deviation of a machine tool. The correction method comprises the following steps: forming a correction reference hole in a part; rotating the machine tool by an angle theta, metering to detect the position of the reference hole, recording the position as an actual value of a reference hole coordinate Y/X, and calculating to obtain a theoretical value of the reference hole coordinate Y/X according to the rotating angle theta of the machine tool and the polar radius R of the reference hole; according to the actual value of the reference hole coordinate Y/X and the theoretical value of the reference hole coordinate Y/X, the coordinate deviation value Y2/X2 of the machining center of the machine tool relative to the theoretical center is obtained through calculation, the coordinate deviation value Y2/X2 is the current positioning precision deviation value of the machine tool, and after a correction value is obtained through the positioning preci