The invention discloses a treatment method for a high-voltage cable head middle core wire. The treatment method comprises the following steps that the section of the core wire is cut neatly, non-linting fine cloth or paper is used for cleaning the surface of the side face of the core wire, the core wire is smeared with conductive paste, after the core wire is sleeved with a chilling-shrinkage type internal insulating sheath pipe and two stress pipes in advance, a copper connecting pipe is used for being connected with the core wire in a pressing mode, then the core wire is sleeved with two thermal-shrinking type external insulating sheath pipes, and meanwhile, abrasive cloth is used for polishing the conical surface and cleaning the surface; finally, the exposed core wire, the copper connecting pipe and the inner protecting insulating layer conical surface are coated with semi-conductor materials, the whole coated external surface forms a neat cylinder shape, the semi-conductor materials are composite materials formed by ethylene-vinyl acetate copolymers, carbon black and organic peroxides. The novel semi-conductor materials are applied, the structure of the semi-conductor coating is set so as to improve field intensity distribution of high-voltage cable connectors, insulating performance of a main insulating layer is improved, and the service life is prolonged.