The invention discloses an automobileplasticsoundproofplate which is prepared from, by weight, 30-35 parts of quartz sand, 16-20 parts of aerosol, 22-28 parts of nano calcium carbonate, 10-15 parts of nano silver, 26-30 parts of graphene, 40-46 parts of polyvinyl chloride, 20-25 parts of polyurethane, 10-15 parts of acrylic cotton, 7-9 parts of silicon oil, 17-21 parts of fatty acid amide, 5-10 parts of oleamide, 5-12 parts of erucyl amide, 14-20 parts of sodium polyacrylate, 25-26 parts of hydroxypropyl methyl cellulose, 7-13 parts of methyl acrylate, 4-8 parts of lead sulfate tribasic, 2-8 parts of aluminum stearate, 11-15 parts of ceramic microbead, 14-18 parts of vermiculite powder and 7-8 parts of tetrapod-like zinc oxide whisker. The automobile plastic soundproof plate is high in structural density and good in soundproof effect, has certain water absorbing performance, is long in service life and has an antibacterial function.