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This invention discloses a water-based adhesive-removing aerosol and its preparation method, relating to the field of daily chemical product technology. The water-based adhesive-removing aerosol comprises the following components by weight percentage: 60-92% water-in-oil emulsion; 8-40% LPG propellant; the water-in-oil emulsion includes an oil phase and an aqueous phase; the weight ratio of the oil phase to the aqueous phase in the water-in-oil emulsion is 1:(1-5); the oil phase includes a mixture of terpenes and emulsifiers or a mixture of terpenes, alkane solvents, and emulsifiers, wherein the terpenes account for ≥15% of the weight of the oil phase. The water-based adhesive-removing aerosol and its preparation method provided by this invention, using a combination of a water-in-oil emulsion and liquefied petroleum gas (LPG) propellant, significantly reduces the amount of organic solvents used, lowers the VOC content of the product, and reduces the flammability hazard of the aerosol.