Abstract: The present invention relates to a quantum dot liquid crystal backlight source, including a blue light LED strip, a fluorescent film containing green quantum dots and a light guide plate, wherein the fluorescent film and the light guide plate are disposed in layers; the blue light LED strip is arranged at one or more lateral sides of the light guide plate; and one surface of the blue light LED strip facing the light guide plate is packaged with a red fluorescent layer. Liquid crystal backlight source of the present invention can avoid that the green light emitted by the green quantum dots is absorbed by red quantum dots or other red fluorescent material, and the blue light LED surface is directly packaged with the red fluorescent layer, so that green light loss can be avoided, the overall brightness of the white light source is increased by 5-10%.