The invention discloses a dual-layer curtain. The dual-layer curtain comprises a supporting box, fixing bases are connected to the two ends of the supporting box and provided with bolt holes, and expansion bolts are arranged in the bolt holes; a supporting rod is fixedly connected to one side of each fixing base, a hook is connected to one end of each supporting rod, and a curtain rod is hung on hooks; multiple slide rings sleeve the curtain rod, a curtain body is fixedly connected to the slide rings, and a long-strip slide hole is formed in the bottom of the supporting box; a limit slide ballis slidingly arranged at the upper end of the long-strip slide hole, a connection rod is fixedly connected to the lower end of the limit slide ball and penetrates through the long-strip slide hole, and multiple clamps are arranged at the lower end of the connection rod. The dual-layer curtain is reasonable in design, simple in structure, attractive in appearance, reasonable in matching, wide in application range and worthy of great popularization and has two curtain hanging modes.