The utility model provides a steerable optic fibre bend radius's protection device mainly solves prior art, and manual operation unable accurate control optic fibre bend radius leads to the problem of optic fibre damage, disconnected core. It mainly includes two identical fixed parts and an arc, the fixed part upside is equipped with first wire casing, and the downside is equipped with T type groove, be equipped with fastening bolt in the T type groove, two the fixed part utilizes fastening bolt and coordinate a fastening nut with the arc is connected fixedly. When specifically using, optic fibre penetrates and fixes in first wire casing, utilize the certain arc of angle can be accurate the bending angle of control optic fibre, and combine a plurality of concrete embodiments right in the description the utility model discloses carry out specify, it effectively solves the unable accurate control optic fibre bend radius of manual operation, leads to the problem of optic fibre damage, disconnected core.