Rectangular light distribution device for high power LED lamp

The invention relates to a rectangular light distribution device for a high power LED lamp. The device comprises a radiator, first light reflecting sheets, second light reflecting sheets and LED light sources. The radiator is of an integrated structure which is formed by a cylinder part and a plurality of radiating ribs, and the cylinder part is composed of a cylinder structure part and a trapezoid structure part. The radiating ribs are arranged on the circumferential face of the cylinder structure part, and the root portions of all the radiating ribs are connected with the cylinder structure part. The first light reflecting sheets and the second light reflecting sheets are located between every two adjacent radiating ribs, the light reflecting faces of the first light reflecting sheets and the light reflecting faces of the second light reflecting sheets are oppositely placed, and one end of each first light reflecting sheet and one end of the corresponding second light reflecting sheet are connected with the outline parts on the two side edges of the bottom face of the trapezoid structure part respectively. The LED light sources are located between the first light reflecting sheets and the second light reflecting sheets and are fixedly connected with the bottom face of the trapezoid structure part. Light emitted from the LED light sources irradiates to the space after being subjected to light distribution by the first light reflecting sheets and the second light reflecting sheets, and accordingly rectangular light distribution can be achieved.