The invention relates to a novel rectifier box for UV crosslink irradiation. In the working process of a conventional rectifier box, heat expansion of a reflecting shade is great, plastic deformation is caused, an elliptical cylindrical surface is destroyed, the direction of the reflection light is changed, the focusing effect can not be achieved, and the use ratio of ultraviolet light is lowered. The novel rectifier box comprises a reflecting shade (1), a set of bases, a set of pressure plate (2) and a casing (3), wherein the reflecting shade is pressed on the bases through the pressure plate, the reflecting shade is a semi-elliptical light reflecting casing, a pair of edge bases (6) is connected with the pressure plate after passing through long round holes at the edge bases on the two sides of the reflecting shade through bolts, a middle base (5) is in threaded connection with the pressure plate after passing through a round hole in the middle bottom part of the reflecting shade through a bolt, and the edge bases serve as the side walls of the casing. The novel rectifier box provided by the invention is used for UV crosslink irradiation.