Taking the stern section of the "Unblocked" ship sunk 12 nautical miles from Yantai Port in 2007 as an example, through in-depth analysis of the actual situation of the project, this paper describes the technical plan formulation, the tension jack system and the construction method of lifting and floating salvage by multiple tension jacks. This technology effectively solves the bottleneck of the construction of fast salvaging large-tonnage shipwrecks. It can also be used for river wreck salvage.