Backlight module and display device

The utility model discloses a backlight module and a display device. The backlight module comprises a diffusion plate; the back plate is matched with the diffusion plate to form a closed space; the backlight lamp is arranged on the back plate and is used for emitting light outwards; the lens covers the backlight lamp and is used for reflecting and transmitting light emitted outwards by the backlight lamp; the lens comprises a conical area, the conical area comprises a conical surface, and the included angle between the conical surface and a conical surface axis is larger than or equal to 60 degrees and smaller than or equal to 70 degrees. By means of the arrangement, on one hand, appropriate light spots can be formed on the diffusion plate of the backlight module with the thickness smaller than the conventional thickness, and on the other hand, sufficient brightness can be provided for the diffusion plate.