Biodegradable material and preparation method thereof

The invention discloses a biodegradable material and a preparation method thereof. The biodegradable material comprises a polyester-polycarbonate block copolymer and a gypsum whisker-nanometer titanium dioxide-sodium alginate composite material which is added into the polyester-polycarbonate block copolymer and accounts for 2-10 wt% of the mass of the polyester-polycarbonate block copolymer; and the gypsum whisker-nanometer titanium dioxide-sodium alginate composite material is prepared by the following steps: dispersing graphite whiskers, sodium alginate accounting for 12-35 wt% of the mass of the graphite whiskers and nanometer titanium dioxide accounting for 0.5-8 wt% of the mass of the graphite whiskers in a water phase under a heating condition, and drying. According to the biodegradable material disclosed by the invention, the gypsum whisker-nanometer titanium dioxide-sodium alginate composite material is added into the polyester-polycarbonate block copolymer, and the gypsum whisker, the nanometer titan