The invention provides an emulsion adhesive for paper-product packaging and a preparation method thereof. The method comprises: Polyvinyl alcohol, instant starch, polyvinyl acetate emulsion, water and kaolin, swell soil, titanium dioxide pigment, calcium carbonate, rubberlith and sodium hexametahposphate are used as main materials; the solid polyvinyl alcohol is dissolved with the water, later dispersed uniformly with the polyvinyl acetate emulsion, alcohol ester and an antiseptic and grinded into a glue liquid of 160 to 200 meshes; then after the kaolin, the swell soil, the titanium dioxide pigment, the calcium carbonate, the rubberlith, the sodium hexametahposphate and the instant starch are uniformly mixed, water is added for stirring the mixture into a uniformly mixed material; the glue liquid and the uniformly mixed material are dispersed together; moreover, a titanium ester coupling agent is added for obtaining the emulsion adhesive after being uniformly mixed. The emulsion adhesive is friendly to the environment, has fast drying speed, high intensity and low cost, is especially suitable to the sticking operation of high-grade paper boxes, has simple preparation technique and considerable economic benefit as well as has excellent market prospect.