The utility model relates to an aquatic supporting type tunnel linkage segment sealing device belongs to structural engineering technical field under water. The stand base is located in the middle ofthe upper seal ring both sides bottom, stand base side is firm with the outside welding of upper seal ring, the stand passes through the bolt and is connected with the stand base, the calabash has been installed at the stand top, be equipped with the crossbeam between the top of coexistence post, be equipped with rings in the middle of the crossbeam, lower seal ring both sides top is equipped withtwo blocks of A steel sheets and two blocks of B steel sheets respectively, a steel sheet and B steel sheet one side are firm with the outside welding of lower seal ring, be equipped with a round hole in the middle of the A steel sheet, B steel sheet bottom is equipped with downward open -ended U -shaped groove, U -shaped tank bottom portion is equipped with a root rubber strip, rubber strip bothends are passed through the bolt and are connected with the B steel sheet, provide linkage segment concreting construction the space under sealing device's protection, sealing device convenient operation, sealing device can retrieve, used repeatedly.