The invention discloses an environment-friendly plastic package bag. The package bag is prepared from, by weight, 40-65 parts of polyolefin plastic, 35-45 parts of corn straw fiber, 5-8 parts of chitosan, 3.5-4.5 parts of methylisothiazolinone, 2-3 parts of bamboo charcoal micro mist, 4-6 parts of methyl phenyl polyborosiloxane, 2.0-2.5 parts of polysebacic polyanhydride, 5.5-7.5 parts of N-phenylmaleimide, 5-7 parts of hexamethoxy methyl melamine resin, 8-10 parts of diethyl malonate, 6-8 parts of decabromodiphenyl ether, 6-8 parts of dibasic lead phosphite, 0.1-0.2 part of coupling agent of organic titanate, 4-6 parts of 3-hydroxybenzoic acid, 1-2 parts of laurinol sulfate, 4-6 parts of plant saponin, 0.1-0.2 part of polyamide wax micro mist and 1-3 parts of antibacterial agent. The package bag has good strength and toughness and is good in optical performance and easy to oxidize and degrade.