The invention discloses a single insulator natural pollution deposit characteristic testing data processing system and a processing method thereof. The single insulator natural pollution deposit characteristic testing data processing system comprises an environmental parameter entry module (1) used for entry of environmental parameters, an environmental parameter preprocessing module (2) used for preprocessing the environmental parameters, a pollution parameter entry module (3) used for entry of pollution parameters, a pollution parameter preprocessing module (4) used for preprocessing pollution parameters, a pollution deposit data matching module (5), a pollution deposit data processing module (6), and a pollution deposit data output module (7).