Pen having adjustable pen holder length

A pen having the adjustable pen holder length comprises a pen holder, a pencil lead, a pen cover, a pen head and a pen cap, wherein the pencil lead is placed inside the pen holder, the pen cover is buckled on the upper end of the pen holder, the pen head is arranged on the lower end of the pen holder, and the pen cap is arranged on the outer side of the pen head in a sleeved mode. An extension pen holder arranged on the inner side of the pen holder is placed above the pencil lead, the bottom of the extension pen holder is provided with two symmetrical limiting blocks, a spring is arranged between the two limiting blocks, the side wall of the pen holder is provided with a plurality of small holes used for containing the limiting blocks, a secondary-level pen holder is arranged inside the extension pen holder, and a spiral ink pipe communicated with the pen head is arranged inside the pencil lead. The pen having the adjustable pen holder length is convenient to carry when the pen holder is retracted, and brings