Hook nail for underground roadway midline point

The invention is mainly applied to the technical field of mining roadway measurement, and particularly relates to a hook nail for an underground roadway midline point. The hook nail comprises a fixed casing pipe. The fixed casing pipe comprises a cone-shaped pipe, a flanging is arranged at the end of the cone-shaped pipe, a mounting hole is formed in the flanging, and a steel wire penetrates through the cone-shaped pipe; and the two ends of the steel wire are both arranged on the outer portion of the cone-shaped pipe, a hanging coil is arranged at the bottom of the steel wire, and a bulge protruding outwards is arranged at the bottom of the hanging coil. According to the hook nail for the underground roadway midline point, the phenomenon that an iron nail hanging line is not firm and prone to falling off can be changed, the point firmness is ensured, and the frequency of line hanging is reduced; and the total sets needing to be subjected to point measuring caused by line re-hanging are reduced, the working lo