Pre-embedded threaded sleeve protection device

The utility model relates to an embedded threaded sleeve protection device which comprises a protection sleeve piece used for sealing one port of a threaded sleeve, the inner surface of the protection sleeve piece is tightly attached to the outer surface of the threaded sleeve, and one end of the protection sleeve piece is a sealed end. The rotating rod is arranged at the closed end of the protective sleeve piece; and the connecting rod is arranged in the protective sleeve piece, the connecting rod is fixedly connected with the closed end of the protective sleeve piece, and threads matched with the threaded sleeve pipe are arranged on the connecting rod. The device is mounted at one end of the threaded sleeve, so that concrete is prevented from being poured into the embedded straight threaded sleeve to cause corrosion damage and thread damage; the device has the advantages of being good in stability, convenient to position, low in overall manufacturing cost, small in occupied space and capable of meeting prot