Metal sleeve type pipeline compensator

The utility model relates to a metal casing pipe type pipeline compensator which comprises a casing pipe and a core pipe arranged in the casing pipe, a first protruding ring is arranged on the inner wall of the casing pipe, a plurality of sealing packings are arranged on one side of the first protruding ring, a sealing gland is arranged on one side of the sealing packings, a sliding ring in sliding fit is arranged outside the casing pipe, and a limiting ring is arranged on the outer wall of the inner end of the core pipe. The sliding ring is provided with a plurality of first screws sequentially penetrating through the second protruding ring and the first supporting lug of the core pipe, the second supporting lug of the sleeve is provided with a second screw penetrating through the second protruding ring and the sealing gland, the sleeve and the core pipe with the corrugated pipe are reliably installed in a sealed mode, the limiting ring slides along the inner wall of the sleeve in a clearance fit mode, and t