The invention discloses a grouping mechanism for a marshalling area. The grouping mechanism comprises a plurality of bases (1) which are arranged in parallel, and is characterized in that first bearing supports (2) and second bearing supports (3) are symmetrically arranged on each base (1); the first bearing supports (2) on each base (1) are movably connected through first rotating shafts (4); the second bearing supports (3) on each base (1) are movably connected through second rotating shafts (5); third bearing supports (6) are arranged between the first bearing supports (2) and the second bearing supports (3) on each base (1); the third bearing supports (6) on each base (1) are fixedly connected through third rotating shafts (7); a plurality of positive grouping mechanisms are arranged on the first rotating shafts (4); and negative grouping mechanisms are arranged on the second rotating shafts (5). The grouping mechanism for the marshalling area has the characteristics of quickness and synchronism in grouping, high yield, high efficiency, convenience in operation, and low labor intensity.