Prefabricated tunnel lining segment

The invention discloses a prefabricated tunnel lining segment, belonging to the field of tunnel construction technology and aiming at simplifying the production and processing technique of prefabricated segments, optimizing the connection mode of segments and improving the prefabricated segment splicing and lining construction efficiency of a shield tunnel, especially round cross section, and the like. The concrete lining in the cross section of a round tunnel is divided into six prefabricated concrete segments, arcs are arranged on the cross sections of the six concrete prefabricated concrete segments, the six concrete prefabricated concrete segments include a top sealing block, two abutting blocks and three standard blocks, and two end surfaces of each block are provided with concave-convex steps which have symmetric or reverse structures; the top sealing block is shaped like a regular wedge which has a symmetrical structure, the two abutting blocks are both partially wedge-shaped and have reverse structures; the two standard block have reverse structures; after a circle of closed lining can be completed by splicing the six concrete prefabricated concrete segments, one ends, provided with bulges, of all segments in the circle are embedded in the cylindrical grooves of the spliced segments in the last circle so as to splice the segments. The prefabricated tunnel lining segment is mainly used for lining of the shield tunnel.