The invention discloses a fermented traditional Chinese herbal immunoenhancer for litopenaeus vannamei. The fermented traditional Chinese herbal immunoenhancer has multiple effects of prevention, healthcare, treatment, immunoregulation and the like, and is a novel ideal, environment-friendly and safe feed additive used instead of an antibiotic medicament. The fermented traditional Chinese herbal immunoenhancer is prepared from compound traditional Chinese herbal medicaments by a traditional Chinese herbal medicament ultrasonic wave-assisted extraction and multi-strain secondary fermentation process, has the dual advantages of the traditional Chinese herbal medicaments and probiotics, is used instead of antibiotics, is safe in use, and has broad market prospect, the intestinal health of the litopenaeus vannamei can be efficiently conditioned, both symptoms and root causes can be treated, the effects of reinforcing the vital essence and strengthening the primordial qi can be achieved, the microecological balance and the optimal immune state of the intestinal tract can be kept, the digestion and absorption rate of nutrient substances can be increased, the organism immunity of the litopenaeus vannamei can be improved, culture incomes can be increased, the culture risk can be reduced, adverse effects on the litopenaeus vannamei are avoided, and the problems of medicinal residues, medicament resistance and the like are solved.