The invention relates to a method and system for processing insulator salt density data bars. The method for processing the insulator salt density data bars comprises the following steps: acquiring on-line monitoring original insulator salt density data bars, wherein the original insulator salt density data bars comprise a plurality of data bars, and each data bar comprises a plurality of data items; comparing each data item of each data bar in the original insulator salt density data bars with each corresponding data item in standard data bars respectively, and selecting wrong data bars according to comparative results; removing the wrong data bars, and maintaining correct data bars. According to the method and the system for processing the insulator salt density data bars, each data itemof each data bar in the original insulator salt density data bars is compared with each corresponding data item in the standard data bars respectively, the wrong data bars are selected, and the wrongdata bars are removed, therefore, the pollution flashover performance of electric transmission line insulators and the accuracy of pollution flashover risk analysis are improved.