The backlight module includes a front frame, a backboard, a heat sink, a light source and a light guide plate. A quantum dot unit is arranged between the light guide plate and the light source. The heat sink, light source and light guide plate are arranged on the backboard, with the heat sink fixing the quantum dot unit to the backboard. The backlight module further includes a middle frame arranged between the backboard and the front frame, and coupled to the heat sink.