Waterproof function of communication optical cable splice,including ontology, on housing and lower housing, is equippedwith two optical fibers on the ontology, the ontology of bothends fixed connection with block, up and down on the top of thebox body and the bottom of the lower housing has match the insertblock slots, two pieces of inserted block are respectivelyinserted in a slot in two, on the ends of the casing wall havelocking mechanism and the first arc plate, on the box Body onboth sides of the wall were connected with optical fiber with thehole, matching the two optical fibers are respectively throughtwo hole is set up, on the bottom of box body is fixed connectionbox type limit board, with the top of the lower housing has amatch box type limit board box type limit slot, box type limitboard plugged in box type limit groove, frame with fixedinstitutions, under fixed agency end is inserted in the box typelimit On a board. The utility model can not only effectivelywaterproof the body, but also effectively improve the stabilityof the fiber.