Bone screw

The utility model discloses a bone screw which comprises a screw rod body. Threads are arranged on the screw rod body. The threads include the front section threads and the rear section threads, wherein the front section threads and the rear section threads are connected with each other, the front section threads are deep threads, and the rear section threads are shallow threads. The outer diameter of the shallow threads and the outer diameter of the deep threads are the same. The inner diameter of the shallow threads is larger than the inner diameter of the deep threads. The front end of the shallow threads is provided with a self-tapping groove. Due to the design of the self-tapping groove, screw-in torsion and screw-out torsion which are increased due to the change of the diameter of the shallow threads and the diameter of the deep threads can be reduced, time of operations can be accordingly shortened, the operation efficiency and operation achievement ratio can be improved, and the risk of screw breakage