The invention relates to a milk beverage containing nanometer SOD and a preparation method thereof. After the milk beverage is prepared, the milk beverage of per kilogram is added with 500 to 2,000 activity units of the nanometer SOD and is fully and evenly stirred. The milk beverage has the characteristics of rich nutrition, delicious flavor, low cost and wide material source, improves taste, promotes appetite, advances the functions of normal metabolism and vision of vitamin A, protects the normal functions of skin and bones, promotes the intelligence development, strengthens immunity, resists aging, regulates blood fat, blood sugar and blood pressure, improves the function of gastrointestinal tracts, resists mutation, tumor and fatigue, improves stress capacity, clears and moistens throat, avoids chemical liver injury, loses weight, has cosmetic functions (removing acne, chloasma, age pigment, maintaining the contents of water and oil and PH augmenting breast), improves nutritional anemia, sleeping and sexual function, increases learning memory, enhances intelligence, promotes growing development, adds no any antiseptic, improves the shelf life by one-third and can meet the requirement of human health and longevity.