Light enhancement diffusion plate, backlight module and liquid crystal display device

The utility model belongs to the technical field of display, and particularly discloses a light enhancement diffusion plate, a backlight module and a liquid crystal display device. The light enhancement diffusion plate comprises a diffusion plate body, a transparent bonding layer, a light enhancement film layer and an optical adhesive layer which are stacked and bonded in the first direction, the diffusion plate body is provided with first diffusion particles, the refractive index of the light enhancement film layer is larger than that of the optical adhesive layer, the face, away from the light enhancement film layer, of the optical adhesive layer is coated with second diffusion particles, the refractive index of the light enhancement film layer ranges from 1.5 to 1.7, and the refractive index of the light enhancement film layer ranges from 1.5 to 1.7. And the refractive index of the optical adhesive layer is 1.3-1.5. The backlight module comprises a back plate, a light reflecting plate and a light bar, the