The invention discloses a down feather composite fiber compounded by waste down feather fiber and acrylic staple fiber. The down feather composite fiber compounded by the waste down feather fiber and the acrylic staple fiber is prepared from the following raw materials in parts by weight: 10-15 parts of superfine goose down powder, 20-25 parts of waste down feather fiber, 25-30 parts of nano goose feather powder, 18-20 parts of acrylic staple fiber, 14-17 parts of collagen fiber, 7-9 parts of nano bamboo charcoal powder, 17-21 parts of coconut shell, 0.3-0.6 part of magnesium oxide, 1-3 parts of perilla frutescens bark, 2-4 parts of rhizoma smilacis glabrae, 13-15 parts of rice straw pulp fiber, 100-120 parts of 1-butyl-3-methyl imidazole dibutyl phosphate, 120-140 parts of 1,3-dimethyl imidazole dimethyl phosphate, 2-4 parts of additives and a proper amount of water. According to the down feather composite fiber compounded by the waste down feather fiber and the acrylic staple fiber, the waste down feather fiber is effectively used; the cost is reduced; meanwhile, perilla frutescens bark and rhizoma smilacis glabrae are added in the down feather composite fiber, so that the mildew and moth of the down feather composite fiber during the storage, transportation and utilization of the down feather composite fiber can be effectively avoided; especially, after the down feather composite fiber is used as a filler and made into articles of daily use, due to the bacteria resistance and bacteriostasis of the down feather composite fiber, the corresponding products have the obvious antibacterial, anti-inflammatory, deodorant, mildew-proof, anit-pruritic and astringent functions, have no stimulation to the skin and are well received by consumers.