Light guide plate, preparation method thereof, backlight module and display device

The invention discloses a light guide plate, a preparation method, a backlight module and a display device. The light guide plate comprises a light guide plate main body; one side of the light guide plate main body is provided with a transparent material layer; and a scattering structure is arranged in the transparent material layer. The scattering structure can change the outgoing direction of first light entering the scattering structure, so that the first light can have different outgoing directions, and therefore, the display panel can perform normal display under a dark environment, and the contrast of the display panel can be improved.