For a high resolution wide waveband infrared spectroradiometer based on linear variable filters, a wavelength calibration method is proposed. Firstly, the initial wavelength is derived theoretically and the linearity of the linear variable filter used is corrected. Then, the wavelength correction is carried out by the characteristic peak matching based on wavelength reference source so as to complete wavelength calibration. Finally, the calibration accuracy is checked by using a laser. The result shows that the calibration accuracy of the proposed method is better than 1%.