Grinding device used before copper rod penetrates through die

The utility model provides a grinding device before a copper rod passes through a die, a rotary cutter assembly comprises a cutter mounting seat and a grinding cutter, the cutter mounting seat is provided with a cutter mounting groove, the grinding cutter is mounted in the cutter mounting seat, a grinding blade is arranged in a through hole of the grinding cutter, and the grinding blade has a gradient from a first end of the through hole to a second end of the through hole. The diameter of a grinding surface formed by the grinding blades is gradually reduced from the first end of the through hole to the second end of the through hole, so that the end part of the copper rod is sharpened; the rotary driving assembly is used for driving the tool mounting base to rotate. Compared with a copper rod pressing mode of a head rolling machine, the copper rod pressing device can enable the surface of a copper rod to be smoother, the size to be more standard and easy to control, and therefore die penetrating is more conv