The invention discloses an LED lamp lighting system for a poultry farm and a construction method thereof.The lighting system comprises an LED lighting lamp, a mounting column, a fixing bottom plate, a middle rod sleeve, a lamp pole and a supporting rod, the LED lighting lamp is arranged on the lamp pole, transverse extending rods are longitudinally distributed on the mounting column, a vertical through groove for the lamp pole to pass through is formed in the mounting column, and the middle rod sleeve is arranged in the middle rod sleeve; a transverse through groove for the lamp pole to pass through is formed in the transverse extension rod, and the transverse through groove is communicated with the vertical through groove; the construction method comprises the following steps: (a) determining a construction boundary; (b) arranging the supporting single bodies; (c) monomer forming; and (d) installing the lamp. The LED lamp illumination system is novel in structure, adjustable in illumination horizontal direction and illumination height, high in applicability, easy to operate and low in use cost, the construction method and process are simple, a single body is changed into an assembly body from small to large, gradual order is achieved, positioning is convenient, labor is saved, convenience is achieved, control is easy, and the construction quality is guaranteed.