Combined reaming cutter

The invention discloses a combined reaming cutter comprising a cutter handle and a cutter body. The cutter body appears as a staircase structure; at least one ball-shaped cutter is arranged on the outer wall of a first projecting step of the staircase structure and at least one reaming cutter is arranged on the outer wall of a second projecting step; and the diameter of the first projecting step is less than that of the second projecting step. The combined reaming cutter provided by the invention can sequentially complete the special machining processes in one clamping so as to enhance machining precision and machining efficiency and also reduce cost of equipment; at least one cooling hole is arranged in a transition surface of a joining part between the cutter body and the cutter handle so as to reduce the heat generated during cutting, reduce cutting friction and prolong service life of the cutter; and once a reamer is worn, the worn reamer can be demounted and then a new reamer canbe arranged; and both the cutter handle and the cutter body are made of imported material H13 and then the intensity of tension and yield strength of the cutter body can be largely enhanced.