Five-axis machine tool rotating shaft angle precision calibration device and calibration method

The invention relates to a five-axis machine tool rotating shaft angle precision calibration device and method, and the method comprises the steps: 1, placing a mounting base at the center of the end face of a five-axis machine tool rotating shaft, and carrying out the alignment and fixing; 2, the rotating disc is embedded into a conical mounting cavity in the mounting base, and the included angle alpha 1 between the zero graduation line on the mounting base and the zero graduation line on the rotating disc is made to be alpha 1 according to the required calibration angle alpha 1 used during part machining; the mounting base and the rotating disc are locked by screws; 3, a rotating shaft of the five-axis machine tool is started to drive the mounting base and the rotating disc to move to the position of a 3D probe of the machine tool, the center coordinate O of a center positioning hole of the rotating disc, the center coordinate value O1 of a measuring hole of the chassis and the center coordinate O2 of the m