Pencil with telescopic pencil core

The utility model relates to a pencil with a telescopic pencil core. The pencil comprises the pencil core and a pencil sleeve, wherein the pencil core is installed inside the pencil sleeve in a coaxial and penetrating mode, the pencil core is installed inside the pencil sleeve in a coaxial and movable mode, the middle portion of the pencil sleeve is provided with a pitted face idler wheel in a radial mode, and the idler wheel rubs the pencil core inside the pencil sleeve. A through hole is machined in the wooden pencil sleeve in the pencil, and therefore the pencil core moves inside the pencil core up and down in a coaxial mode. Therefore, when the pencil is not in use, the pencil core is drawn back inside the pencil sleeve, breakage of the pencil core is avoided, and the pencil with the telescopic pencil core is beneficial for studying.