This review article provides current developments in SnO₂ quantum dots (QDs) as effective catalysts over the last five years. SnO₂ QDs are exceptional prospects for catalytic applications because of their high surface area, compact size, and tunable optical features. SnO₂ QDs have recently made strides in their production and functionalization, which has enabled successful use of them as photocatalytic catalysts. The basic concepts of SnO₂ QDs, including their electrical and optical characteristics, are described in this review paper, along with the most current findings on their production and functionalization. Additionally, it covers the fundamental mechanisms that support SnO₂ QDs’ catalytic activity and emphasizes the difficulties involved in using them as catalysts. Lastly, it offers a forecast for the direction of research in this quickly evolving topic. Overall, our analysis demonstrates SnO₂ QDs’ potential as a successful and cutting-edge catalytic system in recent years.