The invention relates to a pipe rolling mill roller. The roller includes a reducing section, a wall reduction section, a flattening section, a release section and a round making section. The reducingsection, the wall reduction section, the flattening section, the release section and the round making section are formed through combination of smooth connection of a circular arc; and the release section and the round making section form an integrated structure. The roller is simple in structure, can make equipment investment reduce, simplifies equipment structures and a rolling process, can uselarge feed angles and high roll rotation for rolling, so that the rolling speed is fast, and the rolling service life and the production efficiency are effectively improved. The surface of the flattening section is provided with circular bulges, and so, frictional force can be reduced, and the rolling efficiency is improved.