Self-breaking bone nail

The utility model belongs to the field of medical instruments, and particularly relates to a self-breaking bone nail which comprises a head part, a tail part connected with the head part and a threading part arranged at the end, close to the tail part, of the head part in a sleeving mode. A thread is arranged on the surface of the head part, and part or all of the thread is exposed out of the threading part; a necking part is formed at the connecting part of the tail part and the head part; the threading part is a circular truncated cone with a central through hole in the middle, the bottom surface, close to one side of the tail, of the two bottom surfaces of the circular truncated cone is larger, the central through hole is coaxial with the threading part, and the minimum diameter of the central through hole is larger than the diameter of the end, away from the tail, of the head and smaller than the diameter of the end, close to the tail, of the head; the head part penetrates through the central through hole