The invention relates to the technical field of degradable materials, in particular to environment-friendly degradable plastic and a preparation method thereof. According to the invention, 1, 3-
butanediol,
isophorone diisocyanate and stannous iso-octoate are added, so that a
polyurethane prepolymer is prepared. 3, 5-dihydroxy
benzaldehyde,
diglycolic acid, the
polyurethane prepolymer,
terephthalic acid,
adipic acid and catalysts tetrabutyl
titanate and
isocyanate are used as raw materials, and the easily degradable
polyester is prepared. The high-strength antibacterial
polyester is obtained by blending and banburying the easily degradable
polyester, the
chitosan and the antibacterial substance. Finally, high-strength antibacterial polyester,
liquid paraffin,
sodium dodecyl
benzene sulfonate, an
antioxidant and a
plasticizer are added, and the environment-friendly degradable
plastic film is prepared. The environment-friendly degradable
plastic film prepared by the invention has good degradability,
mechanical strength and
antibacterial property, so that the environment-friendly degradable
plastic film has a wide application prospect in the technical field of degradable materials.