The invention discloses environment-friendly and biodegradable type plastics. The environment-friendly and biodegradable type plastics comprises polylactic resin, modified polyvinyl-beta-hydroxybutyric acid PH B, diisononyl phthalate (DINP), tung oil based alkyd resin, soybean protein powder, oxidized cassava starch, alkaline clay, calcium carbonate, kapok fiber, linear low-density polyethylene grafted maleic anhydride, gamma-propyl glycidyl ether oxygen based trimethoxy silane, methyl methacrylate-butadiene-styrol copolymer, aluminum potassium sulfate, citrate, ethylene-eva ethylene, ethylene bis oleamide, methylene diphenyl diisocyanate, an antimycotic antibacterial agent, a degradation agent, antioxidant and a stabilizer. The plastics is good in tensile strength and breaking elongation, good in impact resistance, low in water absorption and good in light-transmitting quality, can be completely degraded into carbon dioxide and water after 132-136 days, and harm cannot be caused to the environment.