Connecting device of silicon core pipe

The utility model relates to the technical field of silicon core pipe connection, in particular to a silicon core pipe connecting device which comprises a connecting pipe, the connecting pipe comprises a first connecting pipe and a second connecting pipe, the first connecting pipe is connected with the second connecting pipe in an embedded mode, and a first outer pipe is arranged outside the first connecting pipe. One end of the first outer pipe is fixedly connected with the end, close to the second connecting pipe, of the first connecting pipe, a first sealing ring is arranged outside the second connecting pipe, the first sealing ring is sleeved with the second outer pipe, internal threads are arranged on the inner side of the first outer pipe, and external threads matched with the internal threads on the inner side of the first outer pipe are arranged on the outer side of the second outer pipe. Corresponding fastening assemblies are arranged at the ends, away from the connecting position, of the first conne