Abstract: A multi-functional portable pen structure comprises a pen barrel and a pen cap to be capped onto the pen barrel, wherein the pen barrel is for storing retractable chopsticks disposed with pen refills and sheaths. In the pen cap is installed a control circuit whereon are disposed a laser element, LED, temperature detector, liquid crystal display, and a plurality of manipulating keys. The laser element, LED, liquid crystal display, and manipulating keys separately protrude from the pen cap, and the temperature detector is disposed on the clamping bar of the pen cap. The portable pen is easy to carry around and provides the functions of laser pointing, illumination, temperature measurement, eco-chopsticks, and writing instrument.