Cylinder lock with strong ability to prevent itself from being destroyed

The utility model provides a cylinder lock head with strong ability of failure resistance. The utility model is characterized in that the upper side of a lock head body is sheathed with a high-strength metal casing which can be used for coating a front end surface and a cylindrical surface. The point of a key hole which is arranged at the center part of the end surface is also provided with a rotatable high-strength metal check ring which is provided with a key slot. The utility model has the advantages of higher ability of failure resistance of drilling prevention and twist prevention, high safety, etc. The utility model is suitable for making various cylinder lock heads.