The present invention discloses a graphene platelet fabrication method, which comprises Step (A): providing a highly-graphitized graphene having a graphitization degree of 0.8-1.0; and Step (B): providing a shear force acting on the highly-graphitized graphene to separate the highly-graphitized graphene into graphene platelets, wherein the graphene platelets have a length of 10-500 μm and a width of 10-500 μm and have a single-layer or multi-layer structure. The present invention also discloses a graphene platelet fabricated according to the abovementioned method.