The invention discloses a Chinese herbal medicine feed additive for piglets and a preparation method of the additive. A formula of the Chinese herbal medicine feed additive comprises components in parts by weight as follows: 56-158 parts of an insect repelling component, 23-55 parts of a conditioning component, 8-12 parts of a nutrition addition component, 5-15 parts of a luring component, 0.5-0.7 part of a compound antioxidant and 0.1-0.16 part of a mould-proof agent, wherein the insect repelling component and the conditioning component comprises bulk drugs as follows: argy wormwood leaf, stemona root, coix seed, pumpkin seed, semen amaranthi tricolorls , spike aletris herb, pagodatree flower, short-leaf lady fern, bark of paper mulberry, prickly ash, prickly ash root, prickly ash leaf, green bristlegrass herb, codonopsis radix, hawthorn fruit, germinated barley, dried tangerine peel and licorice root. The feed additive can dry damp, strengthen spleens, dispel and kill roundworms, warm spleens and stomachs, dispel cold, invigorate spleen, promote digestion, improve the immunity of the piglets, prevent disease and increase weight, and the feed additive can prevent and treat the ascariasis, regulate intestines and stomachs of the piglets, enhance the nutrition intake and greatly increase the weight gain rate when being used for feeding the piglets.