The invention discloses a split internal-pressure sleeve pipe. The split internal-pressure sleeve pipe comprises an outer sleeve pipe and four fan-shaped slide rods sleeving into the sleeve pipe, wherein each fan-shaped slide rod is configured to be a fan-shaped structure which is 1/4 of a whole circle; the four fan-shaped slide rods sleeve into the sleeve pipe in a manner of position correspondence to form an integrated circular rod-shaped structure; and an extension groove formed in a manner of extending inwards is further formed in the outer arc-shaped surface of each of the four fan-shapedslide rods. According to the split internal-pressure sleeve pipe disclosed by the invention, each split slide rod is made to be a slide rod with the fan-shaped structure, each fan-shaped slide rod isconfigured to be a fan-shaped rod with a structure which is 1/4 of a circle, and due to the arrangement, each fan-shaped slide rod can be just placed in the sleeve pipe with a circular structure, andgood position installation coordination is achieved; and the four fan-shaped slide rods can be conveniently placed, so that a more reasonable structure is achieved.