The invention provides a method for measuring equivalent
salt deposit density of a high-
voltage insulator. The method comprises the following steps of uniformly dividing the surface of a high-
voltage insulator needing to be detected into multiple regions, selecting any
measurement point in each one of the multiple regions, eliminating hydrophobicity of the measurement points, spraying a water film on the measurement points without hydrophobicity, measuring local
surface conductivity of the measurement points, calculating average local
surface conductivity by the local
surface conductivity of the measurement points, and calculating equivalent
salt deposit density of the high-
voltage insulator by the average local surface
conductivity. The method realizes measurement of equivalent
salt deposit density of a high-voltage insulator having a strong-hydrophobicity surface without destroy on an insulator
dirt layer structure. Through the method, a researcher can carry out long-term measurement of the same measurement points. The method is convenient for summarization of a
dirt accumulation law, avoids errors caused by other methods in transport and improves measurement accuracy.