The invention discloses an immune enhancement Hepialus American ginseng preparation and a capsule preparation technique thereof. The Hepialus American ginseng preparation is characterized by comprising, by weight, 240-260 parts of American ginseng, 95-110 parts of paecilomyces hepiali hyphae, 140-160 parts of radix astragali, 90-110 parts of Chinese angelica, 180-220 parts of coix seeds, 90-120 parts of radix pseudostellariae, 90-120 parts of codonopsis pilosula, 80-100 parts of northern hawthorn, 75-85 parts of orange peels, 90-120 parts of red dates and 55-65 parts of hyacinth beans. According to integrity of basic theories of Chinese medicine, loss of qi, blood, yin and yang of lung, spleen, heart, liver and kidney is tuned up by tonifying heart-lung qi deficiency, warming and boosting spleen yang, reinforcing the spleen, promoting appetite and nourishing the liver and the kidney, so that fatigue is resisted, and a body immunity function is improved. Medicine taking conditions are improved, the preparation technique is simple and feasible, and the preparation is low in dosage, convenient to take and stable and remarkable in curative effect and has no side effects.