A kind of cutter for mower, system is made with plastic material integrated molding, with a head, from the head side, extended the whole body portion, first long side in the body portion are generally in indent arcuation again, and the second long side is then generally in external convex arc shape, first long side is equipped with the first cutting part that section is in triangular shape, second long side is then equipped with the second cutting part in continuous zigzag, can promote the job security of mower accordingly, it is ensured that its life security.一種割草機刀具，係以塑膠材料一體成型製成，具有一頭部，自該頭部一側再延設一身部，該身部之第一長側邊概呈內凹弧狀，第二長側邊則概呈外凸弧狀，該第一長側邊設有斷面呈三角狀之第一切割部，第二長側邊則設有呈連續鋸齒狀之第二切割部，能據以提升割草工人之工作安全性，確保其生命安全。
