The utility model discloses a tunable optical fiber filter belongs to the wave filter field, tunable optical fiber filter includes: optic fibre collimating system, linear translation platform and control button, optic fibre collimating system fix linear translation bench, control button sets up the outside of linear translation platform. Through setting up optic fibre collimating system, linear translation platform and control button, optic fibre collimating system is linear movement at linear translation bench, forms the resonant cavity, and the light source is strengthened at the resonant cavity internal interference from the left end input to the wavelength is chosen, from right -hand member output, and this tunable optical fiber filter, passband that can accurate tunable filter ware has high resolution, allows high precision measurement.