A light emitting diode is provided. The light emitting diode includes a first semiconductor layer, an active layer, a second semiconductor layer, a first electrode and a second electrode. The active layer is sandwiched between the first semiconductor layer and the second semiconductor layer, and a surface of the second semiconductor layer which is away from the active layer is a light extraction surface of the LED. The first electrode is electrically connected with the first semiconductor layer. The second electrode electrically connected with the second semiconductor layer. A number of three-dimensional nano-structures are formed on the light extraction surface of LED, the number of the three-dimensional nano-structures are aligned side by side, and a cross section of each three-dimensional nano-structure is M-shaped.