Various knives are used in the stone-cutting process, and different knives have completely different functions and functions. This article mainly analyzes the cutting tools used in the stone-cutting process. Hardness is one of the comprehensive factor indexes reflecting the quality of the cutter head. The hardness value should be within a certain range, lower or higher than this range, which means that the quality of the cutter head is not good. According to theory, the hardness of the cutter head must be greater than the hardness of the stone, otherwise, the cutter head will be worn away by the stone quickly, or the saw blade will not be able to saw stone at all.