A cable combination device includes joint terminals configured to be mounted at a joint part formed by jointing a main cable and a branch cable to each other to fix the main cable and the branch cable; a housing configured to have the joint part inserted and mounted therein; and a clip configured to be provided on the housing and fixed to a vehicle body, such that moisture introduction may be prevented by improving water proof performance of the cable, and the cable may be stably mounted in a vehicle by the clip. Therefore, a wiring of the vehicle may be lightened, and at the same time, a cost may be decreased, thereby making it possible to improve marketability.