The invention relates to a damp-snow-proof insulator antifouling characteristic analysis method considering wind speed, dirt and particle size. The method is technically characterized by comprising the following steps: establishing a damp-snow-proof insulator and an air flow field model; performing network division on the air flow field model; setting boundaries and initial conditions of the dampsnow prevention insulator and the air flow field model; solving and calculating the air flow field model; and carrying out subsequent processing on the solving result to obtain the antifouling characteristic of the damp-snow-proof insulator. According to the invention, the typical operation conditions of the region where the damp-snow-proof composite insulator is located are used; a dirt accumulation change rule of the damp-snow-proof composite insulator under parameters such as different wind speeds, dirt concentrations and particle sizes is simulated and calculated; the influence rule and the influence mechanism of different operating environment parameters on the pollution accumulation characteristic of the insulator are analyzed, the influence of factors such as wind speed, pollution and particle size on the pollution prevention characteristic of the wet snow prevention insulator can be accurately analyzed, and a basis can be provided for power transmission line transformation.