Disclosed are a loading system, a seedling tray loading apparatus (200) and a seedling tray loading method. The loading system comprises a transplanter loading platform (300), a seedling tray platform (100) and a seedling tray loading apparatus (200). The seedling tray loading apparatus (200) comprises a controller (201), and at least one detection device (202) and at least one transfer device (203), which are connected to the controller (201), wherein the detection device (202) is configured to be capable of detecting the position of a seedling tray (1000) on a seedling tray platform (100); and the transfer device (203) comprises a telescopic arm (2031), and a transfer unit (2032) mounted on the telescopic arm (2031). After the detection device (202) detects the position of the seedling tray (1000) on the seedling tray platform (100), the transfer device (203) is controlled by the controller (201) to move the transfer unit (2032) to be located between the position, bearing the seedling tray (1000), on the seedling tray platform (100) and the transplanter loading platform (300), so that the seedling tray (1000), which is stored on the seedling tray platform (100), is loaded onto the transplanter loading platform (300) by means of the transfer unit (2032).
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