The embodiments of the present invention disclose a backlight module, a liquid crystal panel and a display device. The backlight module comprises: a light guide plate (5), a plurality of polarization-maintaining optical fibers (3) and a plurality of monochrome laser light sources (1) provided at a lateral portion of the light guide plate (5). The polarization-maintaining optical fibers (3) receive the monochromatic light emitted from the monochrome laser light sources (1) respectively, and transmit the monochromatic light into the light guide plate (5).