▎ 摘　　要

NOVELTY - Preparation of magnesium diboride superconducting wire involves mixing graphene-coated boron powder and magnesium powder and obtaining precursor powder, acid-treating powder, processing into single-core wire, cutting single-core wire, forming multi-core wire, sealing two ends of multi-core wire, heat-treating in furnace and cooling to room temperature. The usage amount boron powder is 20-100 times graphene oxide content. USE - Preparation of magnesium diboride superconducting wire (claimed). DETAILED DESCRIPTION - Preparation of magnesium diboride superconducting wire involves adding oxidized graphene into ethanol, ultrasonically-dispersing and obtaining oxidized graphene solution, adding spherical nano boron powder into the graphene solution, stirring, filtering and obtaining filter residue, drying filter cake in vacuum and obtaining mixed powder, heat-treating powder in reducing atmosphere and obtaining graphene-coated boron powder, mixing graphene-coated boron powder and magnesium powder and obtaining precursor powder, acid-treating powder, processing into single-core wire, cutting single-core wire, forming multi-core wire, sealing two ends of multi-core wire, heat-treating in furnace and cooling to room temperature. The usage amount boron powder is 20-100 times graphene oxide content.