Silver cuprous oxide (Ag-Cu2O) microcomposites are successfully prepared by a facile low-cost solution method. The obtained materials were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy, X-ray photoelectron spectroscopy (XPS). Experiments demonstrated that the formation of Ag-Cu2O microcomposites was significantly influenced by the concentration of AgNO3, and with increasing the concentration of AgNO3, the optical absorption of the composites becomes strong. The photocatalytic activity of the prepared Ag-Cu2O composites was determined by measuring the degradation of methyl orange solution under visible light, to find out its potential application in waste water treatment. The results reveal that the photocurrent of the composite is about 4 times higher than that of pure Cu2O and the visible light photocatalytic activity of the composite is enhanced greatly on degradation of methyl orange. The reason for improvement in photocatalytic activity of the Ag-Cu2O composites was also discussed. (C) 2014 Elsevier Ltd. All rights reserved.