The invention provides a method for discriminating hydrophobic migration characteristics of silicone rubber based on different salt components. The method comprises the following steps: respectively preparing soiling solutions with the salt components of NaCl, CaCl2 and (NH4)2SO4 and an ash component of diatomite; testing the hydrophobicity of samples treated by the soiling solutions with different salt components at different migration times, wherein the testing time is 24h, 48h, 96h and 144h after migration respectively; determining a saturation value of a hydrophobic migration angle, calculating indexes of the hydrophobic migration characteristics according to hydrophobic migration testing results, and discriminating the hydrophobic migration characteristics. By the method, the seven indexes of the hydrophobic migration characteristics are creativity used for comprehensively evaluating the characteristics of the silicone rubber; by the method, through a simulation test based on a variety of soiling solutions, the hydrophobic migration characteristics of the silicone rubber are comprehensively evaluated, so that laboratory test results are more closely related to field application.