The invention relates to the field of cosmetics, and discloses an application of camellia oleosa seed oil. The application is represented in preventing, diluting or eliminating striae gravidarum, moisturizing skin, improving coarse pores, eliminating freckles, removing acne, removing wrinkles, removing dark eye circles and eyelid pouches, implementing make-up and cleansing, preventing sunlight andpreventing radiation. The camellia oleosa seed oil is prepared by a preparation process comprising the following steps: conducting primary pressing on camellia oleosa seeds at 35-45 DEG C, so that crude camellia oleosa seed oil is obtained; and mixing the crude camellia oleosa seed oil with lucid ganoderma, rhizoma curcumae longae and chitosan, and conducting secondary pressing at 25-70 DEG C. The camellia oleosa seed oil prepared by the method provided by the invention, in comparison with camellia oleosa seed oil prepared by conventional methods, is capable of achieving more effective functions of preventing, diluting or eliminating striae gravidarum, moisturizing skin, improving coarse pores, eliminating freckles, removing acne, removing wrinkles, removing dark eye circles and eyelid pouches, preventing sunlight and preventing radiation; the camellia oleosa seed oil, when used for implementing make-up, can enhance fitness of cosmetics to skin; and the camellia oleosa seed oil, whenused for implementing cleansing, can be used for cleaning the skin thoroughly.