The work aims to study and develop the preparation of water-based ink-jet ink for curved-surface ink-jet printing, and decorate the irregular curved-surface products with graphics and text by means of ink-jet printing. Through the selection of resin type, adjustment of the content of color paste and water and addition of other additives, the water-based ink-jet ink with better printability (such as no blockage of the nozzle, proper viscosity and good surface tension) was prepared. For the prepared water-based soft ink-jet ink and hard ink-jet ink, the particle size of the soft ink was 0.2～0.6 μm, the viscosity was controlled at 5～6 mPa?s, and the surface tension was 27～29 mN/m; while the particle size of the hard ink was 0.3～0.6 μm, the viscosity was controlled at 7～8 mPa?s, and the surface tension was 25～27 mN/m. Through the selection of resin type and color paste, and the determination of water content and other additives, an environmentally friendly water-based ink for curved-surface ink-jet printing is prepared.