The present invention relates to a method for preparing an aqueous putty. The present invention is to obtain a polyester polyol having a molecular weight of 500 to 3,000 grams/mole by depolymerizing waste PET by a glycolysis reaction using diethylene glycol; reacting the polyester polyol with dimethylol propionic acid and isophorone diisocyanate to prepare a solid content of water-dispersed polyurethane; It is characterized in that it is prepared by adding calcium carbonate, fumed silica, an antifoaming agent, and Glycidyl propyl trimethoxy silane to the solid content of the water-dispersed polyurethane. The present invention is eco-friendly because it does not generate volatile components harmful to the human body such as VOCs during use, and at the same time has quick drying ability, adhesive strength and adhesion that are not inferior to conventional oil-based putty.
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