Outer diameter forming cutter

The invention relates to an outer diameter forming cutter, which comprises a cutter rod and a cutter blade, wherein one end of the cutter rod is provided with a step, the step comprises a cutter blade support surface and a cutter blade fixing surface, the cutter blade support surface is an inclined surface, an included angle is formed between the cross section of the cutter rod and the cutter blade support surface, the cutter blade is arranged on the cutter blade support surface and is fixedly arranged on the back side of the cutter blade fixing surface, an included angle between the side wall surface of the cutter blade and the cutter rod wall surface parallel to the axial line of the cutter rod is 7 to 10 degrees, and an included angle between the cutting edge of the cutting blade and the cross section of the cutter blade is 9 to 11 degrees. The outer diameter forming cutter has the advantages that the cutter blade cannot be easily abraded, and in addition, the cutting processing is very smooth.