Disclosed in the present invention are a graphene microsheet master batch for enhancing bioplastics and a preparation method thereof. The graphene microsheet/polylactic acid composite master batch is obtained by conveying lactic acid monomers between graphite layers by means of a solvent to obtain modified graphite, adding a polycondensation initiator, subjecting the lactic acid monomers to a polymerization reaction to obtain polylactic acid macromolecules between the graphite layers in situ, such that the distance between the graphite layers is increased and the acting force between the graphite layers is reduced, and subjecting the obtained alternately stacked composite materials of graphene microsheet/polylactic acid macromolecules to shearing, stripping, extrusion and pelletization. As cheap graphite is employed as a raw material in the present invention, the production cost can be effectively reduced, and the obtained master batch is of an alternately stacked and wrapped structure of graphene microsheets and polylactic acid, such that the master batch has the flexibility and the excellent mechanical performance of graphene, and thus can improve the defects of bioplastics, namely that they have low strength, poor high-temperature resistance and poor hot workability.
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