In recent years, the circular cutter machine has been continuously updated and many functions have been added. For example, in recent years, the more active new function of circular cutting knife, modular function, and the function that a ten station circular cutter machine can be used as two circular cutter machines are the result of the realization of modular function. For example, the new circular cutter machine can cooperate with CCD visual die-cutting function, asynchronous transfer function of circular cutter machine, silk screen printing function of circular cutter machine, etc. In the increasing functions, they are improved based on the principle of die-cutting. As an important part of the circular cutter machine, the circular cutting knife plays an important role in the die-cutting process. This article will introduce the causes and solutions of some bad phenomena in the process of die-cutting.