A seedling growing system 10 according to the present invention includes: a cargo transport container 11 provided with heat insulating treatment； a movement robot (movement means) 12 configured to move on a path 112 in the cargo transport container 11； seedling growing tray racks including a multi-shelf germination racks 13 configured to hold, until germination, a seedling growing tray on which seeds are sown, a multi-shelf seedling growing racks 14 configured to hold a seedling growing tray on which seedlings have germinated and including an artificial light source and an automatic watering device, and a multi-shelf shipment rack 15 configured to hold a seedling growing tray for shipping grown seedlings, the racks being disposed side by side on a side or sides of the path 112 in the cargo transport container 11； and a transfer means (slide table 125, pinion gears 126) provided to the movement robot 12 and configured to transfer each seedling growing tray between the movement robot 12 and each of the multi-shelf germination racks 13, the multi-shelf seedling growing racks 14, and the multi-shelf shipment rack 15. The present invention can achieve efficient mass production of vegetable and flower seedlings in a closed environment without influence of weather and season.
