A technical field of liquid crystal display, and particularly, to a backlight module including a reflection sheet, a light guide plate and an optical film group disposed from bottom to top, a quantum dot film group disposed between the light guide plate and the optical film group, a light source disposed to correspond to a side portion of the light guide plate. The light source having an excitation light source and a compensation light source, wherein the excitation light source is used to provide excitation light to enable the quantum dot film group to emit excitation red light and excitation green light entering the optical film group. The compensation light source is used to provide compensation blue light to enable the quantum dot film group to emit blue light entering the optical film group.