The invention relates to acoustic foam, in particular to environment-friendly flame-retardant efficient nonwoven acoustic foam comprising a top layer, a back layer, and a fiber bulk layer between the top layer and the back layer. Both the top layer and the back layer are made of nonwoven. The nonwoven is made with, by weight, 100 parts of isotactic polypropylene, 2-3 parts of decabromodiphenylethane, 3-4 parts of antimonous oxide, 1-2 parts of calcium stearate, 1-2 parts of methyl cellulose ether, 6-8 parts of cassava starch, 2-3 parts of triphenyl phosphate, 12-15 parts of epoxy fatty acid butyl ester, 3-5 parts of peony root, 1-2 parts of tea tree root, 2-3 parts of burdock, 1-2 parts of light yellow Sophora root, 2-3 parts of scandent hop, 1-2 parts of peach blossom, and 4-5 parts of aid. The environment-friendly flame-retardant efficient nonwoven acoustic foam with the outer layer of soft, solid, fireproof and flame-retardant nonwoven has the advantages of environmental friendliness, safety, capability of absorbing noise and reducing noise and the like and has promising application prospect.