Photoelectric element and manufacturing method thereof, backlight module device and illuminating apparatus

The invention discloses a photoelectric element and a manufacturing method thereof, a backlight module device and an illuminating apparatus. The photoelectric element comprises a semiconductor light-emitting lamination layer, a transparent conducting layer and a metal reflecting layer, wherein the semiconductor light-emitting lamination layer is provided with a first semiconductor layer, an active layer and a second semiconductor layer, and the surface of the first semiconductor layer is provided with a plurality of dents; the transparent conducting layer is formed on the surface of the firstsemiconductor layer so that holes containing air are formed in the dents; and the metal reflecting layer is further arranged on the transparent conducting layer so as to form an all-directional reflecting layer with high reflectivity. The photoelectric element and the manufacturing method thereof, the backlight module device and the illuminating apparatus increase light-emitting efficiency of theelement.