The invention discloses a sound-absorbing and heat-preserving composite environment-friendly material for an automotive upholstery. The sound-absorbing and heat-preserving composite environment-friendly material is prepared from, by weight, 100-103 parts of polylactic acid, 3.5-4 parts of nanometer antimonous oxide, 10-11 parts of decabromodiphenyl ethane, 25-27 parts of SEBS, 60-62 parts of hibiscus cannabinus fibers, 10-12 parts of banana fiber paste, 8-9.2 parts of cotton pulp, 2-2.5 parts of epoxy butyl oleate, 7-9 parts of expanded vermiculite, 5-6 parts of cork wood, 5-6 parts of arabic gum and a proper amount of water. According to the sound-absorbing and heat-preserving composite environment-friendly material, the banana fiber paste, the cork wood, the expanded vermiculite and other ingredients are adopted to be prepared into modified powder through a series of processes to be added into preparation of a steeping paste, treated mixed fibers maintain the good bending property, meanwhile, the heat-preserving, sound-insulating and vibration-reducing performance is further improved, and thus the sound-absorbing and heat-preserving composite environment-friendly material can meet the requirement of the functional automotive upholstery and is suitable for producing an instrument table top, a ceiling and the like of an automobile.