The invention relates to a mechanical, antifouling and lightning-proof comprehensive performance analysis method for a wet-snow-proof composite insulator, and the method is technically characterized in that: building a hierarchical structure model of the wet-snow-proof composite insulator through employing an analytic hierarchy process, and building a comparison matrix based on the hierarchical structure model; solving the hierarchical structure model of the wet snow prevention composite insulator to obtain the weights of the double II-type, V-type and inverted V-type insulators; and analyzingthe mechanical, antifouling and lightning protection comprehensive performance of the wet snow-proof composite insulator to obtain the maximum influence factor and specific weight of the wet snow-proof composite insulator in different specific environments. The method is reasonable in design, the final weight of the double-II-type, V-type and inverted-V-type insulators is obtained through analysis according to the characteristics of the wet-snow-proof composite insulator of the power transmission line under the double-string suspension condition, the optimal suspension mode of the wet-snow-proof composite insulator is obtained, and a foundation is laid for application of the wet-snow-proof composite insulator in key areas.