The invention discloses a preparation method of broiler feed. The method comprises the steps of performing superfine grinding on medicated leaven, tangerine peel, cordate houttuynia, scutellaria root, hawthorn fruit and medical stone powder, then adding water to soak the materials for 4-6 hours, boiling, then filtering, performing 5 to 6 times of concentration on obtained filtrate, so as to obtain a concentrated liquor, uniformly mixing corn, bean pulp, peanut shell, bone meal and fish meal, and then performing superfine grinding so as to obtain mixture A, adding the concentrated liquor into the mixture A, uniformly stirring the mixture A, performing heat preservation for 40 min at 80 to 85 DEG C, then adding alums powder, uniformly stirring, continuously performing heat preservation for 1 to 2 h at 50 to 60 DEG C, then cooling the mixture to the room temperature, so as to obtain mixture B, adding calcined oyster shell powder into the mixture B, uniformly stirring, performing heat preservation, and then adding compound vitamins and composite minerals, so as to obtain pellet feed, namely the broiler feed. The feed prepared through the method can ensure that broiler obtains sufficient nutrition, and can improve the growth performance and immunity of young broilers.