The utility model provides a OPGW optical cable fibre core connects inlayer protective case, relates to the optical cable fibre core and connects inlayer protective case. Need the pyrocondensation pipe fixed in order to solve current inlayer protective case to and be unfavorable for the problem that the fibre core penetrated. This protective case includes the protective case body and prevents scurrying the edge, the protective case body is close to optic fibre to be worn the one end of export and is provided with and prevents scurrying the edge, prevents scurrying along for the ring, and the cover is solid on the protective case body, and the circumference of ring department is provided with the arch along the axial of protective case body, protruding to the protective case body be less than or equal to the wall thickness of metal protection pipe apart from d, optic fibre penetrates mouthful to oval mouth. Can prevent still under the prerequisite of not using the pyrocondensation pipe to contract to seal that this protection tube from scurrying out or scurrying into, play the fixed action, optic fibre penetrates mouthful for oval mouthful, is favorable to the fibre core to penetrate. The utility model is suitable for a protection optical cable fibre core.