Anti-cracking sound- insulation composite material and preparation method thereof

The invention discloses an anti-cracking sound-insulation composite material and a preparation method thereof. The anti-cracking sound-insulation composite material comprises the following raw materials in parts by weight: 5-20% of hollow glass beads and 0.2-0.5% of a modified polycarboxylic acid water reducing agent, the vacuum degree of the hollow glass beads is 0.2 g/cm < 3 >, and the particle size of the hollow glass beads is 80 microns; the modified polycarboxylate superplasticizer is prepared by reacting a polycarboxylate superplasticizer with a silane coupling agent containing amino groups at the tail end according to the weight ratio of 1: (2-5) under the action of organic weak base; and the polycarboxylate superplasticizer is modified through the silane coupling agent, the polycarboxylate superplasticizer, the silane coupling agent and the hollow glass beads form an organic matrix-silane coupling agent-inorganic matrix binding layer, the interaction force between the polycarboxylate superplasticizer