Flower cutter used for nicking roll groove of roll

The utility model provides a flower cutter used for nicking a roll groove of a roll. The flower cutter comprises a knurl wheel and a cutter bar. The flower cutter is characterized in that a concave through groove is formed in the front end of the cutter bar; the knurl wheel is fixed in the concave through groove of the cutter rod through a rotating shaft or a bolt; and groove blades which are evenly distributed on the peripheral side face of the knurl wheel. According to the flower cutter used for nicking the roll groove of the roll, the roll which rotates is used for driving the knurl wheel to rotate, a flower cutter body is used for feeding at the same time, and the purpose that the knurl wheel and the roll are extruded and nicked is achieved at last; the flower cutter body is used for nicking the roll groove of the roll, therefore the process that a worker assembles and disassembles the roll is omitted; and the flower cutter body which is convenient to use and small can replace a nicking machine which occu