The invention is equivalent to water soluble intaglio ink of plate engraving ink and / or equivalent to water-soluble screen printing ink of the ink, suitable for a gravure printing machine. The ink has the advantages of nontoxicity, tastelessness, nonflammable property, water solubility, non-environmental pollution and rapid drying; the printing effect of the obtained presswork is the same as or equivalent to the printing effect of the plate engraving presswork; the materialized firmness of the presswork is superior to the materialized firmness of the plate engraving presswork; the ink is low in printing cost and suitable for printing secure and confidential documents with deep printing lines, such as bank notes, securities, stamps, food packing, etc.