New and old concrete combination joint

The utility model belongs to the technical field of civil engineering structures, and discloses a new and old concrete combination node, a fish-mouth-shaped structure is formed between an upper clamping plate and a lower clamping plate, one end of a track plate is clamped between the fish-mouth-shaped structures of the upper clamping plate and the lower clamping plate, and steel bars are arranged in the upper clamping plate and the lower clamping plate for reinforcement; the upper clamping plate and the lower clamping plate are located on the side face of the newly-built beam, a top rib and a bottom rib of the existing rail-mounted plate are anchored into the side face of the newly-built beam, the other side of the newly-built beam is connected with the newly-built rail-mounted plate, steel bars of the newly-built rail-mounted plate are anchored into the newly-built beam, a concrete layer is integrally poured, and a chiseling face is arranged at the new and old concrete combination position of the existing ra