Embodiments of the present disclosure provide a LED device, a light guide plate and a backlight module, which are capable of generating red light, green light and blue light under excitation of ultraviolet light, and reducing damages of human eyes due to blue light by attenuating or eliminating light intensity of the blue light having a wavelength of 460 nm. The LED device comprises an ultraviolet illuminant and a quantum dot film located on a light emitting side of the ultraviolet illuminant. The quantum dot film includes a quantum dot material capable of generating the red light, the green light and the blue light under excitation of ultraviolet light. The wavelength of the generated blue light is within a wave band of 450˜470 nm, and a wave crest of the generated blue light is located within the wave band excluding 460 nm.