A light guide plate, a backlight module, and a display device are disclosed. The light guide plate includes a main body, which includes a light-reflecting surface and a light-exiting surface, a first lattice portion arranged on the light-reflecting surface, and a second lattice portion arranged on the light-exiting surface. The light-exiting surface includes a lattice region formed on a peripheral portion thereof, and a central light-exiting region that is surrounded by the lattice region. The second lattice portion covers the lattice region. According to the present disclosure, the brightness of the peripheral portion of the light-exiting surface can be reduced effectively, and thus the display effect of the electronic products including the light guide plate can be improved.