The present invention relates to a plant growth regulator of elevating anti-stress ability and use thereof. The plant growth regulator, which is consisted of Lactobacillus fermenting culture solution, has excellent thermostability and safety without any side effect, significantly elevating ability against biotic and abiotic stresses. Therefore, the Lactobacillus fermenting culture solution can be applied as the plant growth regulator or a use in preparation of a composition for elevating anti-stress ability of a plant.
