It is a common method to improve the collapse resistance of structures under earthquakes by carrying out the collapse ductility analysis and proposing an optimization scheme to adjust the lateral stiffness of structures. At present, this method is mostly applied to building structures, and the research on the collapse resistance of transmission towers has not been carried out. Therefore, based on the actual transmission line project, this paper established the finite element model of transmission tower based on ABAQUS software, and obtained the collapse ductility of transmission tower by using Pushover analysis ( Pushover ) and incremental dynamic analysis ( IDA ) methods. For the weak sections of the transmission tower, an optimization design method for seismic collapse resistance of the transmission tower with the ratio of inner and outer diameters of the members as the influencing parameter is proposed, and the optimization effect is verified by finite element analysis. The results show that the seismic performance of the weak section of the optimized transmission tower can reach 70 %, and the optimization effect of the non-weak section is about 10 %, which verifies that the optimization method can effectively improve the collapse resistance of the transmission tower and provide guidance for the seismic design of the transmission tower.