Disclosed are an acryl-silicone-based hybrid emulsion adhesive composition and a method of preparing the same. Particularly, an acryl-silicone-based hybrid emulsion adhesive composition that includes an acrylic emulsion resin prepared by emulsion polymerization of an acrylic monomer mixture and a seed formed of a reactive silicone resin and thus has high weather resistance and heat resistance and a method of preparing the same are provided.