The invention relates to a feed suitable for being used in the growing period and the fattening period of portunus trituberculatus. The feed is composed of a solid part and a liquid part, wherein the solid part is composed of the following components by weight percent: fish meal, casein, decrustation bean pulp, alpha-starch. beer yeast, fish oil, shrimp shell meal, sleeve-fish cream, dextrin, hemalbumin powder, complex vitamins, 1-3% complex minerals, choline chloride, an unshelling agent, astragalus membranaceus, poria cocos, common andrographis herb, scutellaria baicalensis, dimethylpropiothetin, sodium diacetate, butyl hydroxy anisd and beta-carotene; the liquid part is EM (effective microorganisms) bacterium liquid. The astragalus membranaceus, the common andrographis herb, the scutellaria baicalensis, the poria cocos and the like are added into the feed prepared by adopting the method, the immunocompetence of the portunus trituberculatus is effectively improved, the stress effect on the portunus trituberculatus in a high-temperature period can be relieved simultaneously, the unshelling and the quick growth are facilitated, raw materials are easy to obtain, the quality is stable, the nutrition is balanced, the palatability is good, and the feed is suitable for the portunus trituberculatus in the growing period and the fattening period.