This seedling growing system 10 has: a cargo transportation container 11 that has undergone a heat insulation treatment； a moving robot (movement means) 12 that moves through a pathway 112 in the cargo transportation container 11； seedling-growing tray shelve racks including multi-level germination shelf racks 13 that hold trays of sowed seedlings until the seedlings germinate, multi-level seedling-growing shelf racks 14 that hold seedling-growing trays in which the seedlings have germinated and that have artificial light sources and automatic water sprinklers, and a multi-level shipping shelf rack 15 that holds seedling-growing trays containing fully grown seedlings in order to ship said seedling-growing trays, the multi-level germination shelf racks 13, multi-level seedling-growing shelf racks 14, and multi-level shipping shelf rack 15 being disposed so as to be aligned sideways through the pathway 112 in the cargo transportation container 11； and a movement means (sliding table 125, pinion gear 126) that is provided to the moving robot 12 and that moves the seedling-growing trays between the moving robot 12 and the multi-level germination shelf racks 13, multi-level seedling-growing shelf racks 14, and multi-level shipping shelf rack 15. According to the present invention, it is possible to produce seedlings of vegetables and/or flowers efficiently and in large quantities in a closed environment, without the effects of weather or seasons.L'invention concerne un système de culture de semis 10 qui possède : un conteneur de cargaison 11 qui a subi un traitement d'isolation thermique ； un robot mobile (moyen de déplacement) 12 qui se déplace par un trajet 112 dans le conteneur de cargaison 11 ； des baies d'étagères de plateaux de culture de semis comprenant des baies d'étagères de germination à plusieurs niveaux 13 qui retiennent des plateaux de semis plantés jusqu'à ce que les semis germent, des baies d'étagères de culture de semis à plusieurs niveaux 14 qui retienn
