The invention discloses a method for promoting the growth of Lilium Oriental hybrids roots under aluminum stress, and belongs to the technical field of flower production and management. The method comprises the steps that Lilium Oriental hybrids seed bulbs are subjected to low-temperature treatment at the temperature of 2 DEGC, and the treated Lilium Oriental hybrids seed bulbs are planted in nutritive bowls; the nutritive bowls are placed in a manual climatic box for culture, and young seedlings are obtained, wherein in the manual climatic box, the light/dark cycle is set as 14 hours/10 hours, the illumination intensity is 10000 lx, the day/night temperature is 25 DEG C/16 DEG C, and the relative humidity is 70%; the young seedlings are placed in a nutrient solution in which the pH is 4.5 and the concentration of Al3+ ions is 100 micromole/L, stress is conducted for 5-15 days, and during the period, indoleacetic acid with the concentration within 2-8 mg/L is sprayed on the young seedlings under the aluminum stress every two days, wherein the spraying amount is 1-3 mL. The method for promoting the growth of the Lilium Oriental hybrids roots under the aluminum stress lays the foundation for culturing a new aluminum-resistant Lilium brownii variety, and therefore, the method is suitable for being applied and popularized in the field of flower production and management.