The invention discloses a special grass carp feed for shrimp and fish polyculture, which comprises the following components in percentage by weight:10-20% of rapeseed meal, 5-10% of cottonseed meal, 20-30% of wheat, 5-20% of DDGS (Distillers Dried Grains with Soluble), 10-20% of grass meal, 5-20% of brewer's grains, 0.1-1% of composite microbial ecological agent, 0.02-0.04% of L-carnitine, 2.5-4%of composite mineral salt trace elements and the balance of filler. Compared with the prior art, after being used, the special grass carp feed can effectively improve the water quality of a pool for shrimp and fish polyculture, also can enhance the released density of grass craps in the pool, improve the quantity of the grass craps, reduce sick probability of shrimps, improve bait coefficient of prawn and increase pool yield.