The present invention discloses a flashlight pen and its combination, and the flashlight pen comprises a penholder being hollow on both ends and having a first accommodating space for accommodating a refill such that one end of the refill is exposed from a tip of the penholder for writing; a cap, being hollow at one end for capping the penholder and having a second accommodating space and at least one decorative strip; a decorative member, being coupled to another end of the cap; a flashlight device, being disposed in the second accommodating space for providing illumination through the decorative member; and a switch, being coupled to the flashlight device and exposed from the cap for turning on or off the flashlight device.