A tool for clamping an optical glass element includes a first arm, a second arm, a first clamping portion and a second clamping portion. The first and second arms are pivotally connected with each other and are rotatable relative to each other about a first axis. The first clamping portion is rotatably connected to an end portion of the first arm distal from the first axis and is rotatable relative to the first arm about a second axis. The second axis is substantially perpendicular to the first axis. The second clamping portion is rotatably connected to an end portion of the second arm distal from the first axis and is rotatable relative to second arm about a third axis. The third axis is substantially perpendicular to the first axis. The first and second clamping portions are configured for cooperatively clamping the optical glass element therebetween.