The invention provides a wind speed sensor based on an optical fiber Bragg raster. The wind speed sensor comprises a guide rod (8) and a wind wheel (1) connected with the termination of the guide rod (8). The guide rod (8) is supported on a support (9) by using two bearings (7); a cam (2) is inlaid between the two bearings (7); an equal-strength cantilever beam (3) is fixed to one of the two bearings through screws (5); a Bragg raster (4) is adhered to the equal-strength cantilever beam (3); and the Bragg raster (4) is connected with an optical fiber demodulation instrument through an optical fiber (6). The wind speed sensor based on the optical fiber Bragg raster has the following advantages: the anti-interference capability is strong, the rotation speed of the wind wheel can be influenced by a wind speed, and the wind speed can be measured by monitoring the dislocation frequency of the center wavelength of the Bragg raster.