A printing ink belongs to the technical field of ink. The printing ink of the present invention is composed of the following substances in parts by weight: sodium alginate, glycerin, triethylene glycol, urea, triethylene glycol monobutyl ether, antifungal agent, polyurethane modified epoxy resin, polyester resin, polyether modified Silicone defoamer, nano aluminum oxide emulsion, cyclohexanone. The present invention uses components such as solid epoxy resin, polyester resin, and wear-resistant emulsion, so that the adhesion and wear resistance of the ink are greatly improved, and the chemical resistance is also better, and the paint is also more delicate. Save ink; the invention has strong stability, clearness, good effect, no insoluble matter, long storage period, and the ink is light-resistant, cold-resistant, acid-resistant, water-resistant, heat-resistant and stable. The inkjet printing ink prepared with this formula The printed pattern is of good quality, no bleeding, no burr, no clogging of the print head, ensuring uniform printing.