The invention relates to an insulator pollution degree evaluation method based on meteorological data statistics. The method is characterized by comprising the steps of 1, meteorological data statistics; 2, pollution accumulation process division; 3, salt deposit density change calculation; 4, pollution grade evaluation. The feasible and effective pollution degree evaluation method is provided for an electric transmission line insulator which lacks an online pollution monitoring device and is located in a high-pollution area, and the method is of great practical significance in anti-pollution flashover measure formulation and implementation based on the insulator pollution degree.