The invention relates to a mixed feed for middle-sized penaeus vanname. The mixed feed comprises, on the basis of weight percentage, 5 to 10 of imported steamed fish meal, 5 to 10 of imported direct-fired fish meal, 10 to 15 of domestic fish meal, 10 to 20 of dehulled soybean meal, 5 to 15 of peanut meal, 1 to 5 of fermented soybean meal , 1 to 5 of soy protein concentrate, 1 to 5 of fermented cotton meal, 20 to 30 of flour, 2 to 4 of cuttlefish paste, 1 to 2 of fish oil,1 to 3 of lecithin oil, 1.5 to 3 of calcium dihydrogen phosphate, 0.1 to 0.3 of choline chloride, 0.2 to 0.4 of betaine, 0.1 to 0.2 of composite vitamin, 0.1 to 0.3 of a composite mineral matter, 0.1 to 0.3 of chitin, 0.1 to 0.3 of immune polysaccharide, 0.02 to 0.05 of an anti-oxidant and 0.05 to 0.2 of a mildew inhibitor, totaling a weight percentage of 100. The mixed feed for middle-sized penaeus vanname prepared in the invention is applicable to penaeus vanname with a body length of no less than 3 cm and has the advantages of good palatability, long duration of resistance to water soaking and easiness in digestion; with the mixed feed, a fast growth speed and a high survival rate of penaeus vanname, little feed waste, small water pollution and a low feed coefficient are realized.