Composite insulators with a superhydrophobic coating can tremendously improve the reliability and stability of transmission line systems and railway systems; thus, they play a crucial role in global electricity issues and power systems. However, the majority of superhydrophobic coatings for composite insulators suffer from weaknesses, such as poor mechanical stability and complicated and toxic preparation processes. To improve these defects, a multifunctional, micro-nanoscale SiO2/epoxy resin superhydrophobic coating for composite insulators was created. The coating maintained excellent superhydrophobicity through a bending experiment, a twisting test, a knife-scratch, a durability test, a pH test and UV light treatment. Moreover, it also performed well in the areas of anti-icing, high thermal stability (300 degrees C), self-cleaning and antifouling. In view of abovementioned advantages, composite insulators with the proposed superhydrophobic coating show great potential for the national economy and power industry.