The utility model relates to a telescopic pen, include: pen holder, pen paste body,
tail plug and pen cover, accommodate the cavity that is set up on pen holder, pen paste body and
tail plug set up in accommodate the cavity respectively, the first end of pen paste body mobile convex to the first end of accommodating cavity, the outside surface of
tail plug and the lateral wall of accommodating cavity mobile abut, and tail plug and the second end of pen paste body abut, cooperate pen cover and set up the ejection part, when needing to use, the user will separate pen cover and pen holder after, can through the ejection part act on the second end of tail plug, and then drive pen paste body to move convex to the outside of accommodating cavity, make the ejection operation of pen paste body quick and convenient, and can adjust the length flexibly, thereby can satisfy the requirement of different pen paste body length when telescopic pen writes or marks, simple and reliable structure, convenient for production at the same time, greatly promoted the practicality and use flexibility of telescopic pen.