A sliding type oversized pipe-diameter underwater manifold comprises a pile foundation structure for providing supporting for a manifold pipeline and an underwater temporary receiving and sending ball cylinder, a pipeline system mounted on the pile foundation structure and a slipping module. A plurality of piling sleeves are arranged at the four corners of the pile foundation structure, and a supporting structure of the underwater temporary receiving and sending ball cylinder is arranged at the tail end of the pile foundation structure. A plurality of sliding limiting pins are arranged on the slipping module and can be inserted into inserting grooves of the pile foundation structure, so that the slipping module is fixed. The manifold is mounted in position, and then the multiple limiting pins are opened. A plurality of sliding guiding structures are mounted on the slipping module and the pile foundation structure. According to the sliding type oversized pipe-diameter underwater manifold, the problem that the cost of using a seabed pipeline material is high is solved, and the project construction cost is greatly reduced; and the manifold can receive and send pipe cleaning balls underwater, pipe cleaning operation and pipeline detecting operation during construction and operation are facilitated, and the later-period operation and maintenance cost is greatly saved.