Polyimide-based acoustic absorption materials are lightweight (density of 40-60 Kg/m3), exhibit excellent sound absorption performance (NRC value of 0.80 achievable with a thickness of 25mm), have good thermal insulation properties (thermal conductivity as low as 0.030 at 0 degrees Celsius), boast outstanding fire resistance (compliant with GB 8624 B1 standard, minimal smoke generation), are water-repellent, environmentally friendly (no odor, no formaldehyde release, compliant with EU REACH standards), free from fibers and dust contamination, and easy to install.