Auxiliary device for precision detection of rotating shaft of machine tool

The machine tool rotating shaft precision detection auxiliary device comprises a base, the upper end of the base is coaxially and fixedly connected with a cylindrical upper end seat, and the upper end plane of the upper end seat is coaxially provided with a circular groove used for installing a laser device. A plurality of adjusting screw rods used for movably adjusting the up-down and left-right positions of the laser device in the circular groove are arranged on the side wall of the upper end seat on the periphery of the circular groove, and after the laser device is adjusted by the adjusting screw rods, the laser device is pressed and fixed through a pressing assembly I; the lower end of the base is fixedly connected with the center of a machine tool. The device has the functions of direct rough adjustment and fine adjustment, so that machine tools with different sizes can be placed for detection, the axis coaxiality of a laser device and the machine tool is less than 0.05 mm, a laser instrument is located