The invention relates to a multifunctional food additive. Raw materials comprise, by weight, 1-5 parts of dioscorea, 2-15 parts of lxora chinensis, 2-15 parts of convallaria majalis, 1-5 parts of perila seeds, 1-5 parts of pueraria, 5-10 parts of tree peony bark, 1-5 parts of orange peel, 2-10 parts of oysters, 1-5 parts of radish seed and 1-5 parts of fructus cannabis. Preferably, the raw materials include, by weight, 3 parts of dioscorea, 15 parts of lxora chinensis, 20 parts of yam, 15 parts of convallaria majalis, 1 part of perila seeds, 3 parts of pueraria, 10 parts of tree peony bark, 3 parts of orange peel, 8 parts of oysters, 3 parts of radish seed and 3 parts of fructus cannabis. The invention further relates to a preparation method for the multifunctional food additive. The multifunctional food additive has the advantages that the food additive can adjust and clear blood vessels from the dietary angle, improve physical conditioning, ameliorate constipation and dredge blood vessels.