Water-based up-conversion fluorescent inkjet ink, and preparation method and application thereof

The invention relates to water-based up-conversion fluorescent inkjet ink, and a preparation method and an application thereof. The water-based up-conversion fluorescent inkjet ink comprises, by mass,0.5-10% of an up-conversion fluorescent material, 20-35% of a binder, 50-60% of water, 4-10% of an alcohol solvent and 0.23-5% of an assistant; the up-conversion fluorescent material comprises rare earth element doped water-based up-conversion fluorescent nanoparticles, and the water-based up-conversion fluorescent nanoparticles are modified with polyethyleneimine. The water-based up-conversion fluorescent ink-jet ink has the advantages of good environmental protection performance and adjustable fluorescence color, suitableness for various printing materials, simple preparation process, highconcealment, achieving of personalized, privately customized and variable information concealment, batch printing on bills, trademarks or high-grade packages, wide application range and high in anti-counterfeiting strength, an