Main shaft circle run-out detection tool

The utility model relates to a main shaft circle run-out detection tool which comprises a base, a plurality of positioning pieces are arranged on the base at intervals in the length direction of the base, a linear guide rail is fixedly connected to the base in the length direction of the base, a sliding seat is connected to the linear guide rail in a sliding mode, an arc-shaped support is arranged on the sliding seat, and the axis of the support is parallel to the linear guide rail. The support is located above the positioning piece, a plurality of dial indicators are evenly arranged on the support at intervals in the arc length direction of the support, measuring heads of the dial indicators abut against the outer side wall of the main shaft, and a screw in threaded connection with the sliding base and a driving motor used for driving the screw to rotate are rotationally arranged on the base. According to the scheme, the driving motor is used for driving the sliding seat to slide, so that the support is driv