The deadline anchor rope wheel is subjected to high-strength alternating load in the actual use of drilling production,and it is prone to fatigue failure.In order to accurately evaluate the fatigue life of the rope wheel,taking the JZG18C deadline anchor as the research object,a method for estimating the fatigue life of the deadline anchor rope wheel under the maximum dead rope tension was proposed using the nominal stress method modified by Goodman equal life curve and the local stress-strain method modified by Morrow elastic stress.The results show that the weak position of the rope wheel of JZG18C deadline anchor is the corner of the sensor arm transition (fatigue life safety factor n1=0.435 1).The minimum fatigue life at the weak position of the rope wheel under the nominal stress method and local stress-strain method are 38 194 times (3.5 years) and 37 120 times（3.4 years）,respectively;and the theoretical calculation results of the two fatigue life evaluations differ from the fatigue life results obtained by finite element analysis by 0.38% and 2.51%,respectively,the reliability and accuracy of evaluating the fatigue life of deadline anchor by nominal stress method and local stress-strain method are verified.