Machine tool spindle clamping unit repairing platform and system

The utility model discloses a machine tool spindle clamping unit repairing platform and system. The bearings and the shaft core are contained in the containing space in the sleeve, the axis of the containing space and the axis of the shaft core are located on the same straight line, the axial precision is guaranteed, gaps between the bearings can be effectively eliminated through installation andfixation of the bearings and the bearing matching mode, and the radial precision and stability of the machine tool main shaft clamping unit repairing platform are guaranteed. A transmission part whichis driven to rotate by the rotation of the machine tool is fixedly connected with the shaft core and the clamping unit; the rotating direction of the clamping unit is opposite to the rotating direction of an external grinding wheel grinding head; the external grinding wheel grinding head abuts against the to-be-repaired taper hole of the clamping unit, during work, the taper hole can be ground and repaired, the structure