The invention relates to a composition having a chloasma removing function and a preparation method thereof. The composition is prepared from 5-40 parts of safflower carthamus, 5-40 parts of radix paeoniae alba, 2-30 parts of radix angelica sinensis, 5-40 parts of poria cocos, 5-60 parts of Chinese dodder seeds and 0.01-10 parts of grape seed extract serving as main raw materials. The preparation method can include the steps that the five traditional Chinese medicines including the safflower carthamus, the radix paeoniae alba, the radix angelica sinensis, the poria cocos and the Chinese dodder seeds are extracted and prepared into extractum, then the grape seed extract is added, and even mixing is performed. The composition gives consideration to primary and secondary symptoms by nourishing liver and kidney, reinforcing qi, nourishing blood and promoting blood circulation to remove meridian obstruction and comprehensively regulates body's health so as to achieve the effect of beautifying the face and removing the chloasma. It proved through an animal toxicity test and an animal and human body efficacy test that the composition is safe and effective.