▎ 摘　　要

NOVELTY - The utility model claims a blood sugar sensor, comprising a substrate and electrode disposed on the substrate, the electrode comprising a working electrode, a reference electrode and an auxiliary electrode, the working electrode, the reference electrode and the auxiliary electrode are separated, wherein the working electrode comprises graphene composite layer, the graphene composite layer comprises a 3D graphene layer and loaded on the nano metal particle in the 3D graphene layer. The blood glucose sensor of the utility model not only has simple structure and small volume, it is convenient to carry, and the detection sensitivity of the high blood sugar, broad detection range, fast response speed.