The utility model discloses a light guide plate, which comprises a light emitting plate and a backlight plate, the backlight plate is vertically connected with the light emitting plate, and the thickness of the light emitting plate is gradually reduced from the middle to at least one end. The distance from the light emitted from the backlight source plate of the light guide plate to the light emitting surface of the light emitting plate is shortened, light diffusion is little, light spots are small, and the emitted light is clear in gradation.