The invention provides a method for preparing a formula feed for broiler chicken in the early stage. The formula feed is prepared from the following raw materials in parts by weight: 50-58 percent of corn, 8-12 percent of bran, 25-28 percent of soybean meal, 1-3 percent of DDGS, 0.5-1 percent of plant oil, 1-1.5 percent of shell powder, 0.3-0.6 percent of edible salt and 4-6 percent of mixed batch, wherein the mixed batch comprises astragalus membranaceus, lonicera japonica, hypericum monogynum, coptis chinensis, fructus forsythiae, radix isatidis, cyrtomium fortunei, pine needle meal, codonopsis pilosula and licorice root. The method comprises the following steps of conducting superfine grinding on the traditional Chinese medicinal materials, and adding an ethanol solution to the mixture; boiling the mixture with strong fire, conducting insulation with slow fire, conducting cooling and filtering, and concentrating the filtrate; adding white granulated sugar, and conducting boiling, cooling the mixture to a normal temperature, and inoculating lactobacillus, tea fungus and bifidobacterium; conducting fermentation for 96-120 hours until white fungal mass grows out, concentrating and drying the bacterial liquid at a low temperature, conducting embedding, and conducting granulation and cooling at a high temperature to prepare a granular feed which is the formula feed for broiler chicken in the early stage. The formula feed can be used for supplying amino acids and trace elements for growth of broiler chicken, has the effects of increasing the number of effective microbial communities in intestinal tracts, improving immunity, enhancing disease resistance of chicken bodies and promoting healthy growth of broiler chicken, and has the advantages of high content of viable organisms and no residue.