Plasma reactor, device and method for improving performance of surface aging area of cable sheath

The invention provides a plasma reactor, device and method for improving cable sheath surface aging regional performance, one end of a plasma reactor connector is connected with a pipeline, the other end of the plasma reactor connector is connected with a reactor body, the reactor body comprises an extension part and a reaction part, and an included angle is formed between the length direction of the extension part and the horizontal plane; a to-be-treated cable sheath is horizontally placed below the reaction part, a ground electrode is arranged below the to-be-treated cable sheath, the reaction part comprises a convex block and a bottom surface, a reactor treatment area is formed between the bottom surface and the to-be-treated cable sheath, a surrounding groove is formed in the convex block, a pressing block is arranged in the surrounding groove, and a high-voltage electrode is placed in the surrounding groove. According to the method, the parameters and sizes of all the structures of the reactor are deter