Hub drilling tool

A hub drilling tool comprises a horizontally-arranged chuck, a cushion claw arranged above the chuck and used for supporting a hub, a cushion ring arranged on the cushion claw and parallel to the chuck, and a clamping claw with the bottom arranged on the chuck, a bearing mounting hole is formed in the hub, the upper portion of the clamping claw abuts against the inner side of the bearing mounting hole, and the lower portion of the clamping claw abuts against the inner side of the bearing mounting hole. The top face of the backing ring makes contact with the bottom end of the hub, a first threaded hole is formed in the bottom of the pad claw, a second threaded hole is formed in the top face of the chuck, the first threaded hole and the second threaded hole are connected through a bolt, a first positioning hole is formed in the top of the pad claw, a second positioning hole is formed in the backing ring, and the first positioning hole and the second positioning hole are connected through a positioning pin. Acco