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This invention relates to the field of novel ink product development technology, and discloses a high-adhesion ink for polyethylene films and its preparation method. Specifically, the invention involves: preparing a long alkyl-chain silane-hydrogen bond type diol monomer; using the long alkyl-chain silane-hydrogen bond type diol monomer as a chain extender for waterborne polyurethane ink, on the one hand, introducing long aliphatic chains onto the side chains of polyurethane molecules to improve the ink's adhesion to polyethylene films; on the other hand, through silane-hydrogen bonds, a hydrosilylation reaction occurs between the silane-hydrogen bonds and the alkenyl functional groups in undecene-functionalized iron(III) oxide, achieving a strong interfacial bond between iron(III) oxide nanoparticles and polyurethane through covalent bonds, thereby achieving highly uniform dispersion of nanoparticles and obtaining a high-adhesion ink. The high-adhesion ink prepared by this invention achieves a significant improvement in adhesion performance and endows the ink with magnetic properties, enabling anti-counterfeiting effects after printing through magnetic action.