We report in this study the improved photocatalytic ability and the photo-corrsion resistance of Ag₃PO_4. We have used PEDOT:PSS as an protective layer to create Ag₃PO₄/PEDOT:PSS nanocomposite photocatalyst. Ag(NH₃)₂⁺ and Na₂HPO₄ were used as the precursor to synthesize Ag₃PO₄. Precursor concentration and ratio were varied. A chemisorption method was then used to make Ag₃PO₄/PEDOT:PSS nanocomposites. Nanocomposites having different ratios Ag₃PO₄/PEDOT:PSS were prepared and investigated. Moreover, Triton-X was used as an additive for further enhancing the conductivity and catalytic power of the Ag₃PO₄/PEDOT:PSS nanocomposite. Methylene blue was used to study the photodegradation performance of the obtained photocatalyst. The photodegradation performance of such a novel nanocomposite is demonstrated.