An aqueous plastic gravure printing surface printing/composite ink, a binder and preparation methods therefor. The ink is formulated from the following components: 68-88 parts of a binder, 10-30 parts of an organic pigment, 0.1-0.15 part of an adhesion promoter, 1-1.5 parts of a drying aid, and 0.2-0.5 part of a defoaming agent. The binder is prepared from the following components: 1-8 parts of a modified rosin, 1.5-4.5 parts of a methacrylic acid monomer or an acrylic acid monomer, 4-25 parts of an acrylate monomer, 20-28 parts of a methacrylate monomer, 0.8-2 parts of azobisisobutyronitrile, 28-30 parts of anhydrous ethanol, 4-7 parts of an amine or ammonia, 0.5-3 parts of a cosolvent and 30-32 parts of distilled water. The modified rosin is used for decreasing the molecular weight and viscosity of an acrylic acid resin, improving the content of the resin in the ink, and adjusting the cohesion of the resin so that the solvent can be easily released, and the fluidity of the ink is good, so as to achieve fast drying and the smoothness of the ink film.
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