The invention discloses a wavelength calibration way for a optical fiber spectrometer, and consists of the following steps, A) a standard light source is applied, standard spectrum is collected through the spectrometer, the image element order number ki of spectrometer receiving element linear array CCD is determined corresponding to the standard light source of different practical wavelength Lambadai; B) the arbitrary three practical wavelength Lambada i and the corresponding image element order number ki are chosen, and in accordance with the above formula, a1, a2, and a3 are determined; C) according to the values of a1, a2, a3 from step B), the calibration calculation wavelength value Lambadai is determined corresponding to every image element order number ki, wherein, the Lambadai is a calibrated wavelength value. The calibrating way of the optical fiber spectrometer is provided by the present invention, the calibration deviation of the calibrating way is much smaller than the calibration deviation of the prior art, and accurate calibration can be done with 3 arbitrary standard spectrum lines, not only the flexibility of the calibration is improved but also the application is easier and more convenient. The invention discloses the calibrated spectrometer applying the above mentioned way at the same time.