The present invention provides a backlight module, which includes a backplane, a reflector plate arranged inside the backplane, a light guide plate arranged on the reflector plate, an optic film assembly arranged above the light guide plate, a backlight source arranged inside the backplane and corresponding to the light guide plate, a mold frame mounted to the backplane, and a resilient block wall that is arranged above the backlight source and a light incidence end of the light guide plate and is fixed to the mold frame by means of force-fitting, bonding, or snap fitting. The resilient block wall has a bottom face and a side face perpendicular to the bottom face. The bottom face and the side face are set in tight engagement with an upper surface of the light guide plate and the backlight source.