The invention discloses a backlight source guide plate with a lattice point. The backlight source guide plate comprises an incident plate and a light giving-out plate, wherein the incident plate and the light giving-out plate are arranged in parallel, side reflection plates are arranged at two sides of the incident plate and the light giving-out plate and are vertically arranged, a first
oblique reflection plate is arranged at one side, near to the incident plate, of each side reflection plate, a second
oblique reflection plate is arranged at one side, near to the light giving-out plate, of the side reflection plate, the incident plate, the first
oblique reflection plate, the side reflection plate, the second oblique reflection plate and the light giving-out plate are of an integrated structure, a single-
surface reflection plate is fixedly arranged between inner walls of sides, near to the incident plate, of the two side reflection plates, a
diffusion plate is arranged between inner walls of sides, near to the light giving-out plate, of the two side reflection plates, a brightening plate is further arranged between the single-
surface reflection plate and the
diffusion plate, the single-
surface reflection plate, the brightening plate and the
diffusion plate are arranged in parallel, and connection blocks are arranged at two sides of the brightening plate and the diffusion plate.The backlight source guide plate has a favorable
light guide effect and is convenient to use, and angle adjustment of a light
ray is facilitated.