Engineering embedded telescopic sleeve with threads

The utility model discloses a threaded pre-embedded telescopic sleeve for engineering, which comprises a first pipe fitting, a second pipe fitting is arranged on one side of the first pipe fitting, the first pipe fitting comprises a first connecting pipe, a second connecting pipe and an external threaded pipe, and the second pipe fitting comprises a third connecting pipe, an internal threaded pipe and a fourth connecting pipe. Baffles are arranged in the ends, away from the outer threaded pipe, of the first connecting pipe and the fourth connecting pipe correspondingly, and the outer sides of the baffles are fixedly connected with the first connecting pipe and the fourth connecting pipe through connecting blocks correspondingly. The telescopic sleeve is simple in structure and convenient to operate, the overall length of the telescopic sleeve is convenient to adjust, the telescopic sleeve is convenient to fix, the situation that the length of the sleeve changes in the concrete pouring process is avoided, the