High-strength polylactic acid material as well as preparation method and application thereof

The invention discloses a high-strength polylactic acid material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The high-strength polylactic acid material comprises the following components in parts by weight: 80-90 parts of polylactic acid, 10-20 parts of poly (butylene adipate-co-terephthalate), 1-5 parts of a nucleating agent and 2-5 parts of a compatibilizer, the mesh number of the nucleating agent is 1500 to 2500 meshes; the compatibilizer is polycaprolactone, and the intrinsic viscosity of the compatibilizer is 1.0-3.0 dL/g. According to the present invention, the melting temperature of PLA and PBAT is reduced, the melting time is shortened, the negative influence of polymer degradation and aging on the mechanical property is reduced, the heterogeneous nucleation effect can be formed, the nucleation effect can be achieved in the cooling crystallization stage, the crystallization speed and the crystallinity can be improved, the cryst