The invention provides a novel silicon rubber line extrusion die sleeve. The novel silicon rubber line extrusion die sleeve can discharge mixed impurities, maintain extrusion production and extrusionperformance and guarantee the aesthetic property and quality of products in the cable extrusion process. The novel silicon rubber line extrusion die sleeve comprises a die core connecting part and a double-nut connecting part, and is characterized in that an inner cavity of the die core connecting part is conically closed up; a center hole is formed in the center of the double-nut connecting part;the center hole is used for matched mounting of a die core boss; a discharge groove extending in the length direction of the die sleeve is formed in the radial position of the outer ring surface of the double-nut connecting part and the die core connecting part; the discharge groove is sunken inwards in the corresponding position of the outer ring surface of the die core connecting part and the double-nut connecting part; the discharge groove covers the whole length of the whole die sleeve in the length direction; and during mounting, the discharge groove is aligned with the glue line combination portion of a machine head.