Full-automatic pencil sharpener capable of changing shape of pencil tip and using method thereof

According to the full-automatic pencil sharpener capable of changing the shape of the pencil point and the using method of the full-automatic pencil sharpener, automatic feeding and pencil sharpening are achieved, and a user can conveniently customize the shape, the length and the thickness of the pencil point according to different drawing requirements. The full-automatic pencil sharpener comprises a shell, and a rotary pencil feeding mechanism is arranged in the shell. The inner side of the shell is symmetrically connected with the fixed brackets; the inner sides of the fixed brackets are connected with the reversing mechanisms in a sliding manner; the knife rest assembly is connected between one sides of the reversing mechanisms; the power devices are connected between the knife rest assemblies and the fixed support; and the operation interface is arranged at the upper part of the shell. The full-automatic pencil sharpener has the function of changing the shape of the pencil point in a personalized mode, i