The present invention relates to a preparation method of a cosmetic product containing a fermented garlic extract. The method comprises: a step in which 90-100 wt% of sterilized rice bran, 1-3 wt% of water, and 0.1-0.3 wt% of sugar are stirred for preventing hay bacillus from adhering thereto a step in which the rice bran mixture is kept warm at 75-85°C for 70-75 hours by being stirred 2-4 times a day, to prevent the formation of anaerobic bacteria a step in which the warm rice bran after the previous steps is kept at 60-65°C for 48 hours for stabilization a step in which the rice bran, while still being kept at 60-65°C, is mixed with yeast, and garlic is placed inside the rice bran, and fermented for a first time for 48 hours a step in which the garlic fermented for the first time is placed in a vacuum chamber and fermented for a second time at room temperature of 30-35°C for three months a step in which a concentrate is extracted from the garlic fermented for the second time, and fermented for a third time at 3-6°C for one month and a step in which the garlic concentrate fermented for the third time is dried and pulverized, and extracted with a solvent to obtain a fermented garlic extract. The cosmetic product of the present invention comprises 0.1-2.0 wt% of the fermented garlic extract with respect to the total weight of the product. According to the preparation method of the present invention, the cloves of garlic are fermented using a particular yeast, and by using the extract of the fermented garlic, the cosmetic product of the present invention significantly reduces the characteristic odor of garlic, offers a high content of antioxidant components, and exhibits excellent effects in terms of skin brightening, enhancing skin firmness, reducing wrinkles, and alleviating and calming skin irritation, and thus can enhance marketability of the product.COPYRIGHT KIPO 2018본 발명은 마늘의 발효 추출물을 함유한 화장품의 제조 방법에 관한 것으로, 이러한 방법은, 멸균 처리된 쌀겨 90-110 중량%, 물 1-3 중량
