The invention relates to a four-way cable combining bridge. The cable combining bridge comprises a four-way main body and a top plate arranged over the main body, the top plate of a four-way structure comprises draining slopes, the main body comprises a base plate and side plates and is internally provided with a four-way wire through channel, first and second fastening parts are arranged between the outer sides of every two adjacent side plates, and the first fastening part is positioned over the corresponding second fastening component; sealing protective strips are arranged in positions where the base plate is connected with the side plates; and the base plate comprises first to fourth channels and a central area. The four-way cable combining bridge is waterproof and has a good heat radiation performance.