The invention relates to the feed processing field, and especially refers to a special feed for Periplaneta americana adults and a preparation method of the same. The special feed for Periplaneta americana adults is composed of a mixture of the following constituents in parts by weight: 40-50 parts of corn, 25-35 parts of wheat bran, 12-16 parts of bean pulp, 1 part of shells of incubated Periplaneta americana nymphs and egg shells, 6-8 parts of fish meal, 0.2-0.3 part of table salt, 0.1-0.2 part of choline chloride, 0.1-0.2 part of copper sulfate, 0.1-0.2 part of potassium iodide and 5-6 parts of oil. Moreover, 10-20 parts of rice bran, 2-4 parts of brown sugar, 30-45 parts of beet and 6-8 parts of sugar residue also can be added. The preparation method comprises the following steps of: A, mixing main materials in parts by weight, then, adding water, stirring and mixing evenly, and stacking for 2-5 days at normal temperature; and B, adding additives in the product of the step A in parts by weight. The feed is relatively low in cost, the Periplaneta americana grows quickly, and the internal amino acid content of the Periplaneta americana is high, so that the Periplaneta americana is high in phamaceutical value.