The invention provides a backlight module. The backlight module comprises a plurality of backlight units. Each of the backlight units includes: a back plate unit; the first reflecting sheet unit is arranged on the back plate unit; the LED lamp is arranged on one side, far away from the backboard unit, of the first reflector unit; each backlight unit further comprises a second reflector plate unitopposite to the first reflector plate unit, the second reflector plate unit is arranged on the side, away from the back plate unit, of the first reflector plate unit and is spaced from the LED lamp, and the second reflector plate unit comprises a plurality of reflection areas and a plurality of transmission areas. According to the backlight module, under the condition that the density of the LED lamps on the back plate is not increased, the distance (light mixing distance) between the back plate and the diffusion sheet can be reduced, and it can be guaranteed that the backlight module achievesthe uniform light emitting effect.