The invention relates to a pollution accumulation characteristic analysis method for a wet snow prevention composite insulator, and the method is technically characterized in that: building a wet snowprevention insulator and a flow field model around the wet snow prevention insulator through employing a Geometry module and a Mesh module of Fluent software, and dividing grids; carrying out fluid mechanics simulation calculation on the flow field model around the insulator by utilizing Fluent, and solving a flow field; repeatedly performing solving according to the variable modification parameters to obtain each element numerical value of each finite element; and obtaining the insulator pollution accumulation characteristics under the conditions of distribution of a gas flow field around the wet snow prevention composite insulator, different wind speeds and different particle sizes. The method is reasonable in design, the difference of flow fields around the wet snow prevention composite insulator under different umbrella-shaped structures and suspension modes is simulated and analyzed, the anti-pollution flashover characteristics and key influence factors of different double-stringsuspension modes, common and wet snow prevention insulators are obtained, and a foundation is laid for application of the wet snow prevention composite insulator in key areas.