The invention discloses expanded pellet mixed feed for murray cod in the middle adult fish stage, and belongs to a mixture prepared by various raw material constituents according to the processing method of expanded pellet feed. The feed is suitable for feeding murray cod in the stage of middle adult fish with the weight being greater than 500g, and comprises the following raw material constituents in percent by weight: 45 to 55 percent of steam dried fish meal, 11 to 14 percent of tapioca flour, 6 to 15 percent of soybean protein concentrate, 5 to 15 percent of bean pulp, 1 to 5 percent of euphausia superba meal, 6 to 10 percent of frozen fish oil, 4 to 6 percent of beer yeast, 1.5 to 2.5 percent of mineral substance, 0.5 to 1.5 percent of monocalcium phosphate, 0.2 to 0.4 percent of choline chloride, 0.1 to 0.3 percent of compound vitamin, 0.3 to 0.5 percent of spirulina, and 0.1 to 0.3 percent of coated sodium butyrate. The feed can improve the culture quality of murray cod, has comprehensive nutrition, is suitable for the murray cod in the middle adult fish stage, is low in cost, has good feed attracting property and good stability in water, ensures that middle adult fish is fast to grow, and has a good economic benefit and a good culture effect.