A binder composition for spray used for interior materials is disclosed to provide glass wool or rock wool with an adhesive force by simultaneously spraying two solutions onto the glass wool or rock wool so that the glass wool or rock wool is adhered to steel or concrete to enhance effects of heat insulation and sound insulation. The binder composition contains a first solution of 200 to 400 parts by weight consisting of polyvinyl alcohol, preservative, antifoaming agent and purified water, and a second solution of 100 parts by weight consisting of boric acid, basic compound, glycerin and purified water.
