The invention relates to a piglet health-care feed additive composition and an application thereof. The feed additive composition is prepared from the following raw materials in parts by weight: 50-200 parts of codonopsis pilosula, 50-200 parts of poria cocos, 50-200 parts of fried atractylodes macrocephala koidz, 50-200 parts of Chinese yam, 10-100 parts of lotus seeds, 50-100 parts of fried white hyacinth beans, 50-100 parts of coix seeds, 50-200 parts of liquorice, 10-100 parts of platycodon grandiflorum, 10-100 parts of elecampane and 10-20 parts of mirabilite. The codonopsis pilosula, the poria cocos and the coix seeds are adopted as main raw material components of the additive, the codonopsis pilosula has the effects of tonifying middle-Jiao and Qi, quenching thirst, tonifying spleen and lung, nourishing blood and promoting the secretion of saliva or body fluid, the poria cocos has the effects of inducing diuresis and excreting dampness, tonifying spleen and calming heart, and the coix seeds have the effects of tonifying spleen and stopping diarrhea, removing paralysis,draining pus, detoxifying and dispelling stagnation, the above ingredients are mixed and matched with the lotus seeds, fried white hyacinth beans, coix seeds, liquorice, platycodon grandiflorum and elecampane, spleen deficiency, dyspepsia and immunity decline of the piglets in the growth process can be improved, the effects of tonifying the spleen, improving the intestinal tract, improving the immune function and reducing inflammatory response are achieved, and healthy development of the piglets is guaranteed.