Screw thread protecting plug

The utility model provides a screw thread protecting plug which comprises a handle body; rubber screw threads are formed on the surface at front end of the handle; and the specification of the rubber screw threads is matched with that of screw threads of a hole for use. The special screw threads, on the surface of which rubber is attached, is adopted, and the screw thread hole is filled through the screw thread protecting plug in a fitted size, so that the screw threads can be prevented from being damaged; and meanwhile, by utilizing the elastic ability of rubber material, the screw threads can be prevented from being damaged when the screw thread protecting plug is taken out, and the mounting and the out-taking are easy. The screw thread protecting plug has a simple structure, and is economical and practical.