The invention relates to a lipid emulsion with a low anisidine value, which contains oily constituents, water, an emulsifying agent and an osmotic pressure regulator, wherein the lipid emulsion contains a metal ion chelant but not an antioxidant. The content of the metal ion chelant is below 100mg/ml. The metal ion chelant is one or more of sodium calcium edentate, edetate disodium, edetate sodium and edetic acid. The invention relates to a method for preparing the lipid emulsion with the low anisidine value as well. According to the invention, in the process of preparing the lipid emulsion, other antioxidants are not needed to add, such as Vitamin E (VE), the antioxidation can be implemented only by using the metal ion chelant, and the low anisidine value can be greatly reduced. The low anisidine value of the lipid emulsion cannot be reduced by adding other antioxidants.