The invention discloses a high-efficiency light emitting diode, which comprises a substrate, an epitaxial layer structure, positive and negative electrodes, transparent sealing glue and a polyimide layer, wherein the polyimide layer covers the surface of the epitaxial layer structure and the surface of the substrate; and the polyimide layer, the substrate, the epitaxial layer structure and the positive and negative electrodes are coated in the diode through the transparent sealing glue. The polyimide layer of the invention has higher refractive index than the existing light emitting diode packaging material, and the total reflection phenomenon of a light source through the epitaxial layer structure, the substrate and the transparent sealing glue jointing surface can be reduced so that the light radiation flux loss resulted from the interior total reflection is reduced so as to enhance the light emitting rate.