Sound-insulating pad used inside automobile and preparation process of sound-insulating pad

The invention relates to a sound-insulating pad used inside an automobile and a preparation process of the sound-insulating pad and belongs to the technical field of automobile interior articles. The sound-insulating pad used inside the automobile is formed by bonding a sound-absorbing layer and a sound-insulating layer with bonding glue, wherein the sound-absorbing layer is made of, by weight, 30-60 parts of bamboo charcoal fibers, 50-80 parts of fibrilia, 20-40 parts of polyester fibers and 10-30 parts of glass fibers. The sound-insulating pad used inside the automobile is formed by bonding two layers of materials, the sound-absorbing layer has the sound absorbing effect and is free of toxin and smell, resistant to water and damp and good in air permeability, the sound-insulating layer not only has the sound insulating effect but also has the effects of thermal insulation, dust isolating, sealing and shock absorption, the two layers are bonded together, sound generated by resonance of metal inside the autom