An alkali metal-modified acoustic reinforcing material, prepared by homogeneously mixing an alkali metal-modified molecular sieve, a binder, a dispersant and an auxiliary agent and then shaping the mixture, wherein the content of the alkali metal-modified molecular sieve is not less than 70%, the dry basis content of the dispersant is not more than 1%, and the dry basis content of the auxiliary agent is not more than 15%, based on 100% of the total weight of the alkali metal-modified acoustic reinforcing material;
- wherein the alkali metal-modified molecular sieve is an alkali metal-modified ZSM-5 molecular sieve or an alkali metal-modified ZSM-35 molecular sieve;
- and wherein the content of the alkali metal is 0.1300-0.4300% or 1.7089%, based on 100% of the total weight of the alkali metal-modified molecular sieve;
- wherein in the ZSM-35 molecular sieve, the molar ratio of silica to alumina is in the range of 20:1-100:1.