The invention discloses a method for inhibiting 
corona discharge and 
dirt accumulation of a direct-current 
transmission line and a 
dielectric film-coated 
electrode wire. The surface of the 
electrode wire is coated with a 
dielectric layer; 
dielectric barrier 
discharge is formed when 
corona discharge occurs on the 
electrode wire; in the discharge process, heteropolar charges are continuously attached and accumulated on the outer surface of the 
dielectric layer, the directions of an original 
electric field of the electrode wire and an 
electric field generated by the heteropolar charges are opposite, the heteropolar charge 
electric field weakens the original electric field, and 
corona discharge can be stopped when the intensity of a synthesized electric field is lower than the intensity of a corona inception field; 
dielectric barrier discharge is formed, so that the electric 
field intensity around the electrode wire is reduced, 
corona discharge is inhibited, the charge quantity of space 
dirt particles is reduced, the electrostatic force for driving the space 
dirt particles to be charged to sink and accumulate dirt is reduced, and the dirt accumulation is inhibited. The method is beneficial to suppression of 
corona discharge of the high-
voltage direct-current 
transmission line, reduction of corona loss, improvement of an 
electromagnetic environment, reduction of accumulated 
pollution, and reduction of external insulation 
pollution flashover and equipment breakdown risks.