Pencil cap

The utility model relates to a pencil cap which comprises an outer shell and an inner shell, the outer shell comprises an inner ring body, the inner shell is of a cylindrical structure allowing a pencil to penetrate through, and a thin groove is formed in the side wall of the upper portion of the inner shell in the axial direction. The upper portion of the inner shell is detachably installed in the inner ring body, and the inner side wall of the inner ring body extrudes the upper portion of the inner shell to enable the inner diameter of the upper portion to be reduced. The inner shell is sleeved on the pencil stub, the upper part of the inner shell is arranged in the inner ring body so as to be tightly attached to the pencil, and a fastening effect is achieved by virtue of friction force between the upper part of the inner shell and the pencil, so that the pencil stub is prevented from being broken; and by means of the structural design of the upper part of the inner shell and the matching mode between the u