Largely deformable rubber gasket for joint sealing

The utility model discloses a large deformation seam sealed rubber gasket, which comprises a double-skin construction, wherein an upper layer is single hole or multiple holes structure adjusting seam deformation and a lower layer is a multi-rib structure for supporting the upper structure and fixing sealed rubber in a preformed groove of a preformed structure. The rubber of the utility model is used in seams which are large in variation range and difficult to limit artificially, which is able to ensure not only construction quality, but also water resistance quality of the seams.