Tunnel lining segment connecting structure and tunnel lining segment group

The utility model discloses a tunnel lining segment connecting structure and a tunnel lining segment group, the tunnel lining segment connecting structure comprises a plurality of segment rings which are sequentially connected along the axial direction of a tunnel, each segment ring is composed of a plurality of segments which are mutually connected end to end, the segment rings are connected through a first connecting structure, and the segment rings are connected through a second connecting structure. The segments in the same segment ring are connected through a second connecting structure, the first connecting structure comprises a first connecting piece, a first caulking seam is formed in the first side face of each segment in the width direction, and a second caulking seam corresponding to the first caulking seam is formed in the second side face of each segment; the first connecting structure comprises a first connecting piece, the first connecting piece is clamped between the two adjacent segment rings