A light emitting diode including a substrate, a first semiconductor layer, an active layer, and a second semiconductor layer is provided. The first semiconductor layer includes a first surface and a second surface. The active layer and the second semiconductor layer are stacked on the second surface in that order, and a surface of the second semiconductor layer away from the active layer is configured as the light emitting surface. A first electrode electrically is connected with the first semiconductor layer. A second electrode is electrically connected with the second semiconductor layer. A number of first three-dimensional nano-structures are located on the second surface of the first semiconductor layer. A number of second three-dimensional nano-structures are located on a surface of the active layer contacting the second semiconductor layer, and a cross section of each of the three-dimensional nano-structures is M-shaped.