The invention relates to a semi-conductive internal shielding material composition. The composition contains an ethylene-butyl acrylate copolymer, an ethylene-vinyl acetate copolymer, an antioxidant, a cross-linking agent, a dispersant, lubricating oil, an anti-copper agent and acetylene carbon black, wherein relative to 100 parts by weight of ethylene-acrylate, the content of the ethylene-vinyl acetate copolymer is 50-65 parts by weight, the content of the acetylene carbon black is 50-72 parts by weight, the content of the antioxidant is 0.1-1.5 parts by weight, the content of the cross-linking agent is 0.5-2.5 parts by weight, the content of the dispersant is 1-10 parts by weight, the content of the lubricating oil is 1-12 parts by weight, and the content of the anti-copper agent is 0.05-1.2 parts by weight. The invention further relates to a semi-conductive internal shielding material for a medium and low-pressure and 110KV cable and a manufacturing method thereof, as well as the medium and low-pressure and 110KV cable. When the semi-conductive internal shielding material provided by the invention is used for extruding the cable, and the phenomenon of scorching can be avoided.