The invention relates to a headlight lens exhausting insert. The headlight lens exhausting insert comprises an insert body and inserting pieces; inserting holes and/or inserting grooves are formed inthe insert body, and the inserting pieces are fixedly mounted in the corresponding inserting holes or the corresponding inserting grooves in an inserted mode; a gap is reserved between each insertingpiece and the side wall of the corresponding inserting hole or the corresponding inserting groove, the inserting holes are the communicating holes, and the side walls of the inserting grooves are notsealed; and when the multiple inserting pieces are inserted and mounted in the inserting holes and the inserting grooves, a gap is reserved between the side faces, facing to each other, of the adjacent two inserting pieces, and the inserting pieces adjacent to the insert body and the insert body are fixed through pins or fixed through bosses. According to the headlight lens exhausting insert, theeffective exhaust area is significantly increased compared with a traditional exhausting insert so that the problem of air trapping can be obviously improved, and the headlight lens exhausting insertis especially suitable for injection molding of a double-color headlight lens.