A light-emitting system, comprising a light source portion and a light-emitting structure, wherein the light source portion comprises a light-emitting source and light emitted from the light-emitting source is directionally output by the light-emitting structure, the light-emitting structure is made of a transparent light-transmissive material and comprises a plurality of extension portions and a plurality of light adjusting portions disposed on a light-emitting structure body, wherein the plurality of extension portions and the plurality of light adjusting portions are sequentially alternately connected; the plurality of extension portions controls the light-emitting range of the light-emitting structure, and the plurality of light adjusting portions is disposed at a predetermined angle with respect to an incident light direction to control a light-emitting direction, wherein the light source portion further comprises a reflection cup and a first reflective mirror, the light-emitting source is disposed inside a notch of the reflection cup, and a reflective mirror surface of the first reflective mirror is disposed opposite to a reflecting surface of the reflection cup, wherein, the light source portion further comprises a second reflective mirror, and a reflective mirror surface of the second reflective mirror is disposed opposite to the reflective mirror surface of the first reflective mirror, wherein the reflection cup is disposed directly below the light-emitting structure, the reflecting surface of the reflection cup reflects and converges the light emitted from the light-emitting source and then emits the light to the reflective mirror surface of the first reflective mirror, and the reflective mirror surface of the second reflective mirror reflects the light reflected from the reflective mirror surface of the first reflective mirror to the light adjusting surfaces of the light adjusting portions of the light-emitting structure for directional output, wherein, in a horizontal extending direction, extension surfaces of the respective extension portions are parallel planes, the extension surfaces of the respective extension portions extend in the same horizontal plane, the light adjusting portions protrude from the horizontal plane, and the extension surface of each of the extension portions is disposed at a second predetermined angle with the light adjusting surface of the adjacent light adjusting portion; wherein a cross section of each of the light adjusting portions of the light-emitting structure is triangular or trapezoidal, and each of the light adjusting portions is provided with a light-receiving surface and a light-reflecting surface opposite to the light-receiving surface; the light reflected by the reflective mirror surface of the second reflective mirror is illuminating the light-receiving surfaces of the light adjusting portions obliquely to the extension portions, is then first refracted on the light-receiving surfaces and is then totally reflected and adjusted by the light-reflecting surfaces, the adjusted light is directionally transmitted through the light-emitting structure body for directional output. the light source portion further comprises a second reflective mirror, and a reflective mirror surface of the second reflective mirror is disposed opposite to the reflective mirror surface of the first reflective mirror, wherein the reflection cup is disposed directly below the light-emitting structure, the reflecting surface of the reflection cup reflects and converges the light emitted from the light-emitting source and then emits the light to the reflective mirror surface of the first reflective mirror, and the reflective mirror surface of the second reflective mirror reflects the light reflected from the reflective mirror surface of the first reflective mirror to the light adjusting surfaces of the light adjusting portions of the light-emitting structure for directional output, wherein, in a horizontal extending direction, extension surfaces of the respective extension portions are parallel planes, the extension surfaces of the respective extension portions extend in the same horizontal plane, the light adjusting portions protrude from the horizontal plane, and the extension surface of each of the extension portions is disposed at a second predetermined angle with the light adjusting surface of the adjacent light adjusting portion; wherein a cross section of each of the light adjusting portions of the light-emitting structure is triangular or trapezoidal, and each of the light adjusting portions is provided with a light-receiving surface and a light-reflecting surface opposite to the light-receiving surface; the light reflected by the reflective mirror surface of the second reflective mirror is illuminating the light-receiving surfaces of the light adjusting portions obliquely to the extension portions, is then first refracted on the light-receiving surfaces and is then totally reflected and adjusted by the light-reflecting surfaces, the adjusted light is directionally transmitted through the light-emitting structure body for directional output.