The invention discloses an extrusion molding mold for an insulation color-separation marker. The extrusion molding mold comprises a conical mold core and a mold sleeve matched with the mold core, wherein the mold core is sleeved with the mold sleeve, a gap is formed between the mold sleeve and the mold core, a guide groove is formed in the mold sleeve, and an injection port is formed in the end of the guide groove. Compared with an existing extrusion molding mold, the extrusion molding mold disclosed by the invention is simple in structure and convenient for operation, is firmly connected mutually along with the extrusion process due to the conical structure, and also can perform extrusion molding for a plurality of color-separation marking belts; the color-separation marking belts after extrusion molding are thin, are uniform and continuous in distribution and facilitate installation of workers.