PROBLEM TO BE SOLVED: To provide a wet coating booth treatment agent capable of solving a serious malodor of booth circulating water and obstacles due to a high concentration of turbid components due to a large increase in the use of water-based paint in a wet coating booth and complicated and diversified operation patterns. Provides a processing method. A wet coating booth circulating water treatment agent and a treatment method containing a methoprene analog compound represented by the following general formula (1). [Chemical 1] [Selection diagram] Fig. 1【課題】湿式塗装ブースにおける、水性塗料の大幅な使用増加と運転形式の複雑化や多様化によるブース循環水の深刻な悪臭や高濃度の濁質成分による障害を解決できる湿式塗装ブース処理剤及び処理方法を提供する。【解決手段】下記一般式（１）で表されるメトプレン類縁化合物を含有する湿式塗装ブース循環水処理剤及び処理方法。【化１】【選択図】図１
