Since the main material of the plug-in foundation transmission tower legs is directly connected to the foundation, this unique structure causes the traditional transmission tower reliability calculation method to be no longer accurate. For this reason, this paper considers the soil-structure dynamic interaction (SSI) between the foundation soil and the tower legs, replaces the upper limit of the natural circular frequency and frequency ratio of the original iron tower with the corresponding value after considering the SSI, and proposes an SSI-based insertion analysis method of vibration reliability of type foundation iron tower. First, the modal analysis of the tower is performed to obtain the natural circular frequency of the tower considering SSI; then according to the external load of the tower under the icing of the wire and the tower vibration displacement equation considering the SSI, the comprehensive amplitude amplification factor expression of the tower is derived, and then the expression is obtained. The upper limit value of the frequency ratio and the function function considering SSI are considered; finally, the normal distribution is combined to solve the problem, and the vibration reliability of the plug-in foundation tower considering SSI is obtained. The proposed method has been applied to the galloping accident analysis of the 500 kV Yidu-Xinglong Ⅰ circuit line. The maximum reliability of the damaged 6-base plug-in foundation tower obtained by this method is 0.971 3, which is less than the target reliability of 0.999 3.