Under strong wind action, the transmission tower-line system is prone to structural deformation and even failure, and accurate identification of weak components in the tower structure is of great engineering value for ensuring the safe operation of power transmission projects. To precisely locate the weak component positions of the transmission tower-line system under wind load, this paper develops an analytical method considering the geometric nonlinearity of large deformation, and independently develops a dedicated calculation program based on G++ and Node.js. A multi-scenario simulation analysis of the tower-line system under different wind load conditions is carried out, and the results show that the weak components of the studied transmission tower-line system are mainly concentrated in the tower body and tower leg units of the displacement tower. The analysis method and research results proposed in this paper can provide technical guidance for the wind resistance design and stable operation maintenance of transmission tower-line systems.