Provided is a uniform-rotational-speed width/breadth spacing rice seedling transplanter, comprising a vehicle frame, a seedling tray (1), and a transplanting mechanism; the transplanting mechanism is provided with a rotating bin (2); the two ends of the rotating bin (2) are provided with transplanting arms (3), and each of the transplanting arms (3) is provided with a rice-seedling transplanting claw (4); the seedling tray (1) is connected to a seedling tray drive mechanism, the seedling tray drive mechanism is provided with a screw shaft (6), the seedling tray (1) is provided with a screw-thread guide block (7); the guide end of the screw-thread guide block (7) is adapted to fit into the thread groove of the screw shaft; the thread groove of the screw shaft is formed by spacing the long lead groove (61) and the micro lead groove (62) at intervals. When the rice seedling transplanter is operating, it alternates between inserting while empty once and actually inserting twice, thus implementing a width/breadth spacing rice-seedling transplantation method; the invention has a simple structure and good stability.
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