The invention discloses a functional nutritional agent for regulating the disharmony of intestinal florae and enhancing
immunity and a preparation method thereof. The functional nutritional agent is prepared from four traditional Chinese medicines of Szechwan tangshen root, largehead atractylodes
rhizome, Indian buead and honey-fried licorice in a weight ratio of 2:2:2:1 and spirulina, wherein a weight ratio of the four traditional Chinese medicines to the spirulina is 1-6:1-6. The preparation method comprises the following steps of: concentrating decoction of the four traditional Chinese medicines, inoculating
lactobacillus to the concentrated decoction, and fermenting to obtain
fermentation liquor of four gentlemen decoction; performing ultramicro crushing on the spirulina, inoculating
bifidobacterium and fermenting to prepare
fermentation liquor of the spirulina; and mixing the
fermentation liquor of the four gentlemen decoction and the fermentation liquor of the spirulina, centrifuging to remove thalli, inactivating
enzyme and
drying to obtain the functional nutritional agent. The functional nutritional agent can prevent and correct the disharmony of the intestinal florae and enhance
immunologic function, and also can protect hematopoietic function and blood liquidity, balance the
metabolism of trace elements and improve endocrine function, so the functional nutritional agent is suitable for
crew who perform long-distance navigation on naval vessels or submarines.