Clamping tool for milling two symmetric planes of bearing outer ring

The invention discloses a clamping tool for milling two symmetric planes of a bearing outer ring. The clamping tool comprises a base, a positioning top plate is fixedly arranged above the base, a connecting frame is arranged between the base and the positioning top plate, two or more pull rods are connected to the connecting frame, the lower portions of the pull rods and the connecting frame are movably sleeved, the upper portions of the pull rods and the positioning top plate are movably sleeved, and the upper portions of the pull rods extend out of the upper end face of the positioning top plate; a pressing arm is connected to the top of each pull rod, at least one pressing part is arranged on each pressing arm, and a positioning mandrel used for positioning bearings to be machined is arranged at the position, corresponding to each pressing part of each pressing arm, of the upper end face of the positioning top plate; a protruding column is arranged in the middle of the connecting frame upwards, and is conn