The utility model relates to an internal thread seamless heat transfer pipe. The thin-high tooth internal thread seamless heat transfer pipe of the utility model comprises a pipe wall and a plurality of tooth ribs arranged on the inner surface of the pipe wall; the tooth ribs form a screw thread in a helical mode. The utility model is characterized in that: the cross-section of the tooth rib comprises a trapezoid, the top of the trapezoid is a convex arc transition, the bottom of the trapezoid and the pipe wall are connected through an arc, the ratio of the tooth height of the tooth rib and the thickness of the pipe wall is Hf/Tw=0.75-1.00. The utility model solves the problems that the prior heat transfer pipe has unsatisfactory fluid conduction effect and heat exchange effect, and is easy to crack or distort in the subsequent working procedures.