Oxidation by photo-Fenton like reaction is ail economically feasible process for degradation of a variety of hazardous pollutants in wastewater from dyeing and printing industries. Oxidation of rhodamine-B, (an acid dye of xanthene series) using photo-Fenton reagent has been carried out Under ambient conditions. The effect of different parameters like the concentration of ferric ion, rhodamine-B, pH, hydrogen peroxide, light intensity etc. oil the reaction rate has been observed. A tentative mechanism For the degradation of rhodamine-b by photo-Fenton's reaction has been proposed.