Method using graphene in-situ coating boron powder to prepare magnesium diboride superconductive wire rod via magnesium diffusing method

The invention discloses a method using graphene in-situ coating boron powders to prepare a magnesium diboride superconductive wire rod via a magnesium diffusing method; the method comprises the following steps: adding an oxidation graphene water solution and boron powers into deionized water so as to obtain a boron powder and oxidation graphene mixture solution; using a hydrothermal reaction to process the solution so as to restore the oxidation graphene into graphene, compositing with boron powders, separating products and depositing and drying same, thus obtaining graphene in-situ coating boron powders; fixing a magnesium rod in a metal tube, filling the graphene in-situ coating boron powders between the magnesium rod and the metal tube, thus obtaining a tubular body and forming a singlecore wire rod; filling a plurality of single core wire rods and a conductive metal rod into the metal tube, thus forming a multi-core wire rod; thermal-processing the multi-core wire rod so as to obtain the magnesium diborid