Telescopic embedded sleeve

The utility model discloses a telescopic embedded sleeve which comprises a long PVC pipe with threads inside and internal threads, the internal threads are arranged inside the long PVC pipe with the threads inside, and external threads close to the internal threads in the long PVC pipe with the threads outside are arranged outside the long PVC pipe with the threads outside. The inner diameter value of the long inner threaded PVC pipe is equal to the diameter value of the long outer threaded PVC pipe. According to the telescopic embedded casing pipe, the long PVC pipe with the threads inside and the threads correspondingly arranged outside the internal threads are used in cooperation, before use, accurate measurement is conducted, production is conducted according to use requirements reported to manufacturers, the length is accurate, reinforcement is convenient, the structure is simple, embedded deviation is prevented, the casing pipe is prevented from being covered by concrete, and the die attaching rate of t