The invention relates to a pipe heat-extrusion remnant material and pipe separation method which comprises the following steps of (1) adopting a two-section type ladder core rod as a core rod structure; (2) loading a heated hollow billet and a heated extrusion pad into an extrusion container; (3) simultaneously advancing an extrusion rod and the core rod, and stopping when the extrusion rod contacts the extrusion pad; (4) continuously advancing the core rod, and sequentially penetrating into inner holes of the extrusion pad and the hollow billet; (5) locking the relative positions of the corerod, the extrusion pad and the extrusion rod, forwards pushing as a whole, and enabling the hollow billet to flow out through an annular space formed by the core rod and an extrusion die from the extrusion container so as to form a pipe; (6) when the position of the extrusion rod arrives at the remnant material position, stopping moving the extrusion rod, continuously advancing the core rod, pushing the hollow billet metal to continuously flow out from the space of the core rod and the extrusion die, and stopping until the back-end step position of the core rod stretches out of an extrusion die hole for 20 to 50mm; and (7) separating a pipe body and a remnant material. The pipe heat-extrusion remnant material and pipe separation method provided by the invention solves the problem of the separation of the remnant material and the extruded pipe body during thick-wall high-strength alloy pipe heat extrusion.