The photocatalytic destruction of organic dyes and contaminants using semiconductor photocatalysts has been widely investigated for water purification. However, the requirement for UV light for photocatalyst activation hinders its practical applicability due to its low percentage in solar light; consequently, enhancing its activity is critical. To prevent this issue, bandgap adjustment can be processed by the introduction of metal or non-metal dopants or the production of composites of diverse materials. Silver phosphate is an outstanding visible-light-driven semiconductor photocatalyst, demonstrating exceptional photoactivity for water splitting and degradation of pollutants in aqueous solution. Though the photocorrosion phenomena of Ag3PO4 limit its application, Ag3PO4-based photocatalysis was able to overcome this phenomenon and expand the scope of application for treating polluted water. This study summarized the techniques made in this subject to remove barriers to practical implementation and improve photocatalytic performance. The various strategies for the synthesizing Ag3PO4 and different nanocomposites were then discussed.