In a water recycle painting system wherein a water paint is spray painted on an object to be painted in a painting booth, and wherein over sprayed paint captured in booth circulating water is condensed and recovered to be mixed with the water paint for reuse, a method for suppressing foams in booth circulating water for effectively suppressing foams in booth circulating water generated when spray painting water paint to thereby maintain a good working environment, the method being characterized in that the booth circulating water includes a silicone antifoamer (A) and a hydrophilic high-boiler (B).