The utility model provides an optic fibre cladding device, belong to optic fibre production technical field, divide exhibition mould (2) and optic fibre forming die (1) including the fibre, be equipped with optic fibre forming through - hole (101) on optic fibre forming die (1), the fibre divides exhibition mould (2) to set up in optic fibre forming through - hole (101) front side, it divides exhibition portion to be equipped with a plurality of curved fibres on the fibre divides exhibition mould (2), the fibre divides the diameter of exhibition portion to be greater than the diameter of opticfibre forming through - hole (101), optic fibre (4) coaxial pass optic fibre forming through - hole (101), the fibre is from the getting into all around of optic fibre (4) optic fibre forming through- hole (101) after the fibre divides the exhibition of exhibition portion annular branch. Good mechanical properties and temperature characteristic such as optic fibre through after the encapsulationnot only has more excellent tensile, resistance to compression, bending resistance, antitorque commentaries on classics, shock resistance lay the constitutional features that the mode did not rely ontesting object in addition, can popularize and apply the optical fiber sensing technique in environment abominable engineering field.