Single-atom catalysts (SACs) are a new type of material that can load metal on the carrier in atomic state. They have the advantages of high atom utilization, strong catalytic activity and easy recovery, so they have attracted much attention in the catalytic degradation of organic pollution. In this work, the influencing factors of SACs were introduced, and the applications of SACs in environmental field for catalytic degradation of organic pollutants are summarized. In addition, the catalytic mechanisms of SACs of different transition metals (...