Novel seal connection structure capable of dismantling and replacing tube bundle and tube plate

The invention relates to a seal connection structure, in particular to a novel seal connection structure capable of dismantling and replacing a tube bundle and a tube plate. The novel seal connection structure comprises a tube plate body and a heat exchange tube body. A threaded tube hole is formed in the tube plate body; a wedge-shaped surface is arranged at the end of the threaded tube hole; the threaded tube hole is connected with a compression nut through a screw thread; a backing ring is disposed on the right side of the compression nut; one to three O-shaped seal rings are disposed on the right side of the backing ring; four notches which are circumferentially and uniformly distributed are formed in the end of the compression nut; the acute-angle included angle between the wedge-shaped surface and the horizontal plane is 45 degrees to 60 degrees; the O-shaped seal rings are made of a polytetrafluoroethylene material; the compression nut is of a sleeve structure of which the inner diameter is equal to th