In order to study the evolution law of cutting edge wear characteristics of pure iron materials during precision cutting,a precision cutting experiment of pure iron materials was carried out with coated carbide tools as the research object.The results show that the wear characteristics include uniform flank wear land,major notch wear,minor notch wear and tool tip wear in finish cutting pure iron materials with coated carbide tools;the wear length of the major and minor notch wear increases with the increase of cutting time and is greater than the flank wear,the notch wear length has a significant positive relationship with the notch wear depth basically;the cutting edge degradation and the flank wear law correspond to each other,the initial wear rate is large,and the subsequent wear is slow.