The present invention discloses a backlight module, which comprises a plastic frame, a backplane, a light guide and an optical film, the backplane comprises a mutually perpendicular vertical plate and horizontal plate, the plastic frame and the light guide are provided inside the backplane, the optical film is close to the upper surface of the plastic frame and the light guide. The present invention further provides a display device, which reduces the size of the plastic frame through pasting the optical film on the upper surface of the plastic frame and the light guide, achieving the ultra-narrow frame design.