The invention discloses a functional cosmetic additive, which comprises 3 to 5 portions of Chinese goldthread, 5 to 10 portions of radix scutellariae, 3 to 8 portions of phellodendron, 2 to 8 portions of rhobarb, 2.5 to 7.5 portions of cirsium japonicum, 2.5 to 7.5 portions of field thistle, 5 to 10 portions of vietnamese sophora root, 3 to 8 portions of Chinese soapberry, 3 to 6 portions of natural indigo refined by water, 2 to 5 portions of field mint and 0.5 to 1.5 portions of borneol; which are preliminarily crushed and mixed by the water, and are processed by a superfine grinding at high pressure into micron size, then filtered by a membrane, so as to get the additive. A prescription of the additive is made according to the rational compatibility of the characteristic of traditional Chinese medicine, which can be used for treating comprehensively a symptom of a skin allergy and fester caused by various reasons, and has good effects of antianaphylaxis and antiphlogosis. During the preparation course, the advanced technologies such as the superfine grinding and the membrane filtration are adopted simultaneously, which effectively prevents macromolecule material blocking the pore of the skin such as dust and bacterium, etc., from entering into the additive; therefore the additive is not capable of blocking the pore when in use within a cosmetic, which leads the cell of the skin normally breath and absorb nutriment substance without producing side effect, and has the good effect of the antianaphylaxis.