The invention provides a composite peptide solid beverage capable of improving immunity and relieving fatigue and a preparation method of the composite peptide solid beverage. The composite peptide solid beverage is prepared from the following raw materials in parts by weight: collagen peptide, bone collagen peptide, soybean peptide, walnut peptide, a fructus lycii extract, a rhizoma polygonati extract, a folium mori extract, a fructus jujubae extract, a semen ziziphi spinosae extract, inulin, isomaltooligosacharide, fructo-oligosaccharide, chitosan oligosaccharide, magnesium sulfate, L-calcium lactate, zinc gluconate, vitamin A, vitamin D, vitamin E, vitamin B1, vitamin B2, vitamin B6, vitamin C12, vitamin C, nicotinic acid, folic acid, pantothenic acid, taurine and beta-carotene. The composite peptide solid beverage contains small molecule peptides from various sources, medicinal and edible tonifying active substances and various vitamins and minerals necessary for human bodies, is rich in nutrition, good in synergistic effect, convenient to absorb and utilize, capable of remarkably improving the immunity of the organism and supplementing nutrition, and beneficial to reducing three-high indexes of patients.