Hot melt adhesive based on revulsive orientation of magnetic particles and preparation method of hot melt adhesive

A hot melt adhesive based on revulsive orientation of magnetic particles consists of a basic hot melt adhesive and inorganic magnetic particles, mass ratios of the inorganic magnetic particles to the basic hot melt adhesive are (1-10) to 20, and components of the basic hot melt adhesive and mass percentages of the components are as follows in percentage by weight: 50 to 70% of ethylene-vinyl acetate copolymer, 20 to 40% of tackifying resin and 5 to 15% of plasticizer. A preparation method of the hot melt adhesive is as follows: adding the tackifying resin into a reaction kettle, heating to a melting point of the tackifying resin, and keeping a temperature; and then stirring, adding the ethylene-vinyl acetate copolymer into the reaction kettle after the tackifying resin is completely molten; adding the plasticizer into the reaction kettle when the tackifying resin and the ethylene-vinyl acetate copolymer are uniformly mixed; adding the inorganic magnetic particles into the reaction kettle after the components