The present invention relates to a LED lighting apparatus, comprising a quadrilateral-shaped casing with side walls inclined; a LED lighting module array disposed inside the casing and composed of a plurality of LED lighting modules lined up to emit light; a converter formed on a portion of the outside of the casing supplying power to the LED lighting modules; and a multi-bending reflection minor reflecting light emitted from the LED lighting modules, wherein the LED lighting module array comprises a LED module base combined with a portion of the upper inside surface of the casing; a plurality of LED module brackets connected to a lower portion of the LED module base; a plurality of metal PCB boards combined with a lower portion of each LED module bracket; a plurality of LED chips mounted on the metal PCB boards; and a plurality of lenses concentrating rays of light emitting from the LED chips into focus. Further, the lenses of the LED lighting apparatus according to the present invention have either a plurality of curved surfaces or various curvatures.