The invention discloses feed for reducing shell rot disease of sea shrimps as well as a preparation method and application of the feed. The feed consists of fish oil, purple potato powder, shrimp shell powder, phospholipid oil, superoxide dismutase SOD, a dandelion root extract, an antioxidant, a mildew inhibitor, a hylocereus undatus extract, an epimedium herb extract, neutral protease, carotenoid, polygonum multiflorum vine extract, choline chloride, a herba houttuyniae extract, betaine, a medicated leaven extract and a fructus lycii extract. The feed is difficult to get mildew and go bad, and caking and odor smells are avoided; and the feed is high in stability in water, cannot be scattered in 4 hours to 5 hours, and has no residues and side effects; pH of intestinal tracts of the sea shrimps can be kept at 5 to 7, vibrio cell outer membranes are damaged, vibrio parahaemolyticus, aeromonas, myxobacteria and flavobacterium can be killed, survival ratios of the sea shrimps are increased by 15 percent to 25 percent, the anti-stress capability of the sea shrimps is improved, the proliferation capability is improved, the palatability of feed is good, a digestion ratio is increased, the growth speed of the sea shrimps is high, the body length is increased by 20 percent to 50 percent, and the sea shrimps are 29cm to 36cm long.