A radial type light-guiding plate comprises a light source, a light-guiding plate, and a reflective component. The top face of the light-guiding plate is a light output face, and the bottom face thereof is a reflective face. The light source is disposed at sides of the light-guiding plate. The reflective face has channels, which radiate toward the sides near the light source. Because the channels are radial, the reflected light rays in the range of the light-guiding plate near the light source will be less. The light emission near the light source thus will not be too bright. Because the channels of the light-guiding plate that are far from the light source are closer together, light rays can be effectively transmitted thereto to increase the brightness of light emission therefrom, hence letting the brightness of the whole light output face be more uniform.