The invention provides a children emollient containing a lactobacillus fermentation extract and a preparation method of the children emollient. The children emollient is prepared from the following raw materials of butyrospermum parkii fruit fat, hydrolyzed yeast protein, xylitol, glucose, hydroxyphenyl propionamide benzoic acid, coconut oil, shea butter, olive fruit oil, squalane, simmondsia chinensis seed oil, white oil, cetostearyl alcohol, glucoside, polyglycerol, provitamin B5, glycerol, xanthan gum, a preservative, a thickening agent, a skin barrier repairing agent, a repairing composition and the balance of water; and the skin barrier repairing agent is prepared from ceramide, phytosterol and fatty acid. The children emollient prepared by the invention can care and moisten delicate skin of children in multiple directions, for example, after sunburn, the skin erythema index is effectively reduced, the water content of the skin is increased, and the damaged skin is repaired. In addition, the product has a waterproof function, the skin protection requirements of children under various situations are met, and the damaged skin of the children can be better repaired through the synergistic effect of various repairing components.