The synchronous lifting process is a key technology for non-destructive salvage and smooth transfer of ancient ships and their internal cultural relics to the predetermined dock. This paper, starting with the principle of computer controlled hydraulic synchronous lifting technology, and taking the actual underwater synchronous lifting project of Sewol in South Korea as an example, demonstrates the feasibility of the technology transfer to the underwater cultural relic salvage project. In addition, it elaborates on the planning of the elevator arrangement, control actions, and system requirements for the integral salvage and relocation project of the ancient ship. Moreover, it introduces the construction implementation details of synchronous lifting equipment. The hydraulic lift follows vertical layout, and the hardware assembly involves the installation of steel strands, bottom anchors and brackets, hydraulic cylinders, control systems, and underwater pins. The success of the integral salvage of “Yangtze River Estuary II” ancient ship has demonstrated the efficiency of the large-scale oil cylinder computer control system in improving the safety and integrity of the salvaged object in marine sunken ships, opening up a new implementation path for the integral salvage and relocation of related ancient ships in the future.