A backlight module and a display device are disclosed, which relate to the field of display technology and overcome the problem of poor heat dissipation effect of the whole display device. The backlight module comprises a backplane, a light source component fixed to the backplane, and a first heat dissipation layer at least arranged in part of the overlapping zone for the backplane and the light source component. The display device comprises a display panel and the backlight module mentioned above, and the backlight module provided by the embodiment is applied in the display device.