The invention aims to provide a lamp rubber part forming mold. According to the technical scheme of the lamp rubber part forming mold, the lamp rubber part forming mold is composed of a lower mold plate, an upper mold plate, a first insert strip and a second insert strip; the lower mold plate is provided with four lower mold plate positioning holes, a first insert strip clamping station lower groove, a second insert strip clamping station lower groove and two insert strip lower forming grooves; and the upper mold plate is provided with four upper mold plate positioning holes, a first insert strip clamping station upper groove, a second insert strip clamping station upper groove and two insert strip upper forming grooves. The mold is used for forming a connecting piece at the position of anexternal connector of a lamp pipe of a lamp platform, assembling, disassembling, mold closing and demolding are facilitated, and a glue overflowing phenomenon is prevented; the mold is distinct in structural concept and easy to operate; and by means of the structural design of inserting or pulling for mold closing, assembling of the mold and demolding separation of a finished product are more facilitated, the working efficiency is improved, the sealing performance is higher, the glue overflowing phenomenon in the injection molding process cannot be caused, the lamp rubber part forming mold ismore environmental-friendly and practical, and the machining quality of the product is improved.