High-sealing connecting pipe

The utility model discloses a high-sealing connecting pipe which comprises a first pipe body and a second pipe body, the first pipe body and the second pipe body are in threaded connection, colored liquid is arranged between a protective shell and a first rubber plate, the pipeline connecting position is loosened, and therefore when water leaks, leaked water can penetrate through a second rubber pad to be absorbed by water absorption expansion rubber, and the water leakage is avoided. The water absorption expansion rubber can be enlarged after absorbing water, so that a moving plate is jacked, the moving plate can drive a pushing column to move, the pushing column can jack a rubber plug, the rubber plug is jacked out of a protective shell, colored liquid between the protective shell and a first rubber plate can flow out, and a worker can be reminded of the water leakage condition at the pipeline connecting position; and a first rubber pad is fixedly arranged at the bottom of the protection plate, second conne