The invention relates to a nutrient powder and its preparation method. The nutrient powder is made of soybean protein isolate, soybean oligopeptide, vegetable fat powder, milk powder, complex vitamine, mineral substance components, etc, viz. soybean protein isolate, soybean oligopeptide, vegetable fat powder, milk powder, soybean lecithin, vitamine A. vitamine D, vitamine E, vitamine C, vitamine B1, vitamine B2, vitamine B6, nicotinic acid, choline, folic acid, Ca, Fe, Zn, Se, Mg, and taurine. The invention is provided with unique formulation, and can rapidly supplying energy and nutrient, especially protein, for dissipating fatigue, promoting restoration of skeletal muscle, strengthening immunologic function, improving motion ability, rapidly restoring physical strength, etc, thereby it can contribute to health, disease-resistance improvement, and motion score improvement, accordingly, the health-care food can be used for soldiers, sportsmen, moderate or hard physical labors in training or working, and be suitable for chronic fatigue patients to use for a long time.