The present invention relates to a pen needle provided with a safety protection system, which utilizes a shuttlecock-shaped supporter blade of an elastic material to simplify the structure and reduce the number of parts to reduce the manufacturing process and size of the pen needle, thereby providing a less expensive, simpler and safer pen needle, in order to prevent the pen needle, which is a one-time consumable item to be inserted and fastened into a pen-type syringe in a screw-coupled manner, from being reused after a single use.