Nano-sized SrTiO3 and SrTi0.7Fe0.3O3 photocatalysts were prepared by the complex route precursor method. The prepared photocatalysts were characterized by XRD, TEM, XPS and diffuse reflectance. The effect of iron doping on the structural properties and the photocatalytic activity was studied. All the prepared samples have single cubic perovskite structure. It was found that doping of SrTiO3 with Fe shifted the peak positions toward higher 2θ value, decreased both the cubic lattice parameter and the unit cell volume, decreased the average crystallite size of SrTiO3 from 53 nm to 35 nm and shifted the absorption to the visible light range (red shift). The photocatalytic degradation activity of 30 mole % Fe doped SrTiO3 was significantly improved the degradation of dibutyl phthalate in 90 minutes under visible light irradiation by 4 times higher than SrTiO3.