The invention relates to an optical fiber cabling die which comprises a die sleeve and a die core. A die core plug-in is inserted in an axial conical hole in the center of the die core and internally and axially provided with at least one optical fiber channel and at least one reinforcer channel; an optical fiber guiding protective tube is fixedly mounted in each optical fiber channel; the die sleeve is provided with a conical hole; the front end of the die core is in a conical shape and is matched with the conical hole of the die sleeve to form a conical flow passage which is communicated with the reinforcer channels; the front end of die core plug-in is arranged in the die core; each optical fiber guiding protective tube penetrates through both ends of the die core plug-in; and the front end of each optical fiber guiding protective tube extends forwards to a position between an inner port and an outer port of an extrusion hole of the die sleeve. The optical fiber cabling die processes a bare optical fiber into an optical fiber and enables melted plastics to not only tightly wrap the reinforcer, but also avoid damaging the bare optical fiber in a cabling process, thereby ensuringthe quality of the processed optical fiber.