A pullable light-emitting pen has a light-emitting body and a refill. The light-emitting body and the refill can act synchronously. Thereby, at night light is illuminated from the light-emitting pen so that the user can write easily. A cover is located at a top of the light-emitting pen. When the cover is pulled, the light-emitting body and the refill will protrude out from the pen tube for writing. When the cover descends, the light-emitting body does not light up again. Thus the light-emitting pen can be placed in a pocket. The light-emitting body and refill embeds into the pen tube. The power supply is hidden so as to have a beautiful outlook. The pulling of the cover can prevent the mistake of incorrectly lighting up so that power is saved. Decorations on the cover can present an attractive outlook.