In order to accurately and efficiently calculate the dynamic wind-induced deflection displacement response of overhead lines， and further prevent the occurrence of wind-induced deflection flashover accidents， this paper considers the characteristics of the wind-induced deflection of the overhead lines and the relative movement of each insulator in the insulator string， multiples rigid rods and torsion springs are used to connect to each other to simulate overhead conductor. According to the mechanical relationship of wind-induced deflection and the principle of energy conservation， a multi-rigid-body model and dynamic equations of wind-induced deflection of overhead lines are established. A physical simulation model wind tunnel test is designed by dimensional analysisand similarity theory to verify the accuracy of the multi-rigid-body model. Through numerical simulation analysis based on engineering examples， and comparing the calculation time of the multi-rigid-body model and the general software finite element model， the efficiency of the multi-rigid-body model is verified. The results show that the multi-rigid-body dynamic model of wind-induced deflection of overhead lines can show the wind-induced response law of each insulator string and each conductor. The calculation accuracy can meet the needs of engineering application， and the calculation efficiency is better than the finite element model.