In this work, novel magnetically separable g-C 3 N 4 /Fe 3 O 4 /Ag 3 PO 4 /WO 3 nanocomposites were successfully prepared in a simple and inexpensive method to photodegradation of organic dyes as important pollutants in wastewaters of textile industries. Their photocatalytic activity were investigated for degradation of Rhodamine b, Methylene blue and Acid blue(40) as three organic pollutants under sunlight irradiation. The prepared samples were characterized using XRD, FT-IR, FE-SEM, EDX, Zeta potential and DLS. In optimal conditions, the percentage of degraded dyes were more than 96% under the sunlight simulator. The results indicate that the degradation reaction is not stopped at the breaking the band that formation of color and proceed to formation of species such as water and carbon dioxide. The kinetics of the degradation reaction of all dyes that used are followed the secound order. Reduction of band gap energy and improvement of light absorption in the visible region for the modified photocatalyst were evaluated by using Tuac’s plot and Cyclic Voltammetry method Finally, the photocatalyst was magnetically separated from the treated solution after five cycles.