The invention discloses an aged feed for plant breeding of penaeus vannamei and a processing method of the aged feed. The formula of the aged feed consists of the raw materials of fish meal, soybean meal, fermented soybean meal, chicken meat powder, flour, peanut meal, soybean lecithin powder, fish oil, soybean oil 1, calcium dihydrogen phosphate, a mineral mixture, a vitamin mixture, a mildewproof agent, an antioxidant, squid paste and a functional compound, wherein the functional compound adopts the formula of beta-glucan, yeast nucleotide, vitamin C and astaxanthin. According to the aged feed for plant breeding of penaeus vannamei and the processing method disclosed by the invention, the ageing degree of the processed aged feed is greater than 95%, the water stability is guaranteed, pollution caused by dissolving losses of the feed and the discharge of nitrogen and phosphorus to water bodies is reduced, the stability of the feed in water is good, the nutrition is balanced, the autoimmunity and the stress resistance are high, the accumulation quantity of the astaxanthin is large, and the phenomenon that shrimp bodies become blue seldom occurs.