A sapling growing apparatus includes: a carriage including racks in eight tiers and traveling along a circulation path in indoor space externally shielded from light and externally heat insulated； an LED mounted on the carriage and emitting light to the multiple saplings in a tray on the racks； a watering unit arranged in the indoor space and supplying water to the saplings in the tray； a water vapor generator and a cold air flow generator that creates given temperature and humidity environment in the indoor space； and an illumination management unit that creates light environment distinguishing between day and night artificially by turning on and off the LED. A large number of saplings are grown uniformly on a large scale while being moved in a circular pattern under the artificial growing environment.
