The present invention provides a light-emitting element comprising a first electrode, a conductive substrate, a metal reflecting layer, a p-type semiconductor layer, a light-emitting layer, an N-type semiconductor layer, three-dimensional log pile-shaped photonic crystals, and a second electrode, wherein the above parts are successively stacked up. Photonic band gaps exist among the three-dimensional log pile-shaped photonic crystals to limit the direction of light propagation. Based on the above design, the light is only enabled to propagate in the vertical direction, so that the loss of the light in the horizontal direction is avoided. The light emitting efficiency is improved. A fluorescent layer is added. The nano-phosphor powders of the fluorescent layer or the quantum dot florescent materials of the fluorescent layer are filled in the photonic band gaps. The light-emitting spectrum is modulated by the three-dimensional log pile-shaped photonic crystals. In this way, the light-emitting element is high in light-emitting efficiency and adjustable in color-changing temperature, and the color-rendering performance of the light-emitting element is improved.