The present invention discloses a peanut oil using grosvenor momordica glycosides as an antioxidant and having a sweet taste. The peanut oil is characterized by being prepared by adding the grosvenor momordica glycosides into peanut oil. The advantages of the peanut oil are that natural food sweetener grosvenor momordica glycosides V is applied to the peanut oil. The test proves that the antioxidant effects of the grosvenor momordica glycosides V are the same as the antioxidant effects of chemically synthesized antioxidant tertiary butyl hydroquinone (TBHQ), and the grosvenor momordica glycosides can extend the storage period of peanut oil, are free of harms to human body, and can also improve the quality of peanut oil.