The invention discloses a high-adhesion emulsion for a cigarette packet film and a preparation method thereof, and the high-adhesion emulsion is composed of the following raw materials: acrylic resin, a cationic emulsifier, an anionic emulsifier, 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, an emulsifier, a dispersant, a thickener, a thickener and a solvent. The water-based acrylic resin is prepared from 1, 6-hexanediol diacrylate, a first monomer, a second monomer, a third monomer, a fourth monomer, a fifth monomer, a nonionic emulsifier, a silane coupling agent, an initiator, dimethyl maleic anhydride, ethylene glycol, ethylenediamine, adipic dihydrazide and deionized water. The preparation method is simple and convenient to operate, by strictly controlling the adding time, the reaction time and the reaction temperature of all the raw materials, the reaction rate balance in the early stage and the later stage of the emulsion preparation process can be kept, the conversion rate and the stability of the reaction can be improved, and the prepared emulsion has excellent adhesive force and chemical resistance to a cigarette packet film; and the adhesive force to non-absorbent substrates such as BOPP (biaxially-oriented polypropylene), PP (polypropylene), PVC (polyvinyl chloride), PE (polyethylene) and PET (polyethylene terephthalate) plastic films is excellent.