In recent years, advanced oxidation processes (AOPs) have been widely used to remove contaminants from wastewater, but the disadvantages of high cost and energy consumption limit the application of this technology. The development of low-cost, efficient and reusable catalysts to reduce the cost of this technology is an effective way to improve the application of AOPs. Transition metal sulfides (TMS) have good conductivity, mechanical stability and thermal stability. TMS with adjustable band gap can be used as photocatalysts. This paper reviews the applications of TMS in AOPs. TMS can increase reduction rate from Fe3+ to Fe2+ in Fenton process by exposing metallic active sites with unsaturated sulfur atoms, directly activate persulfate or peroxymonosulfate and act as photocatalysts. The modifications of TMS are also introduced, which can increase the active sites and reduce the band gap through element doping; improve the conductivity and enhance the catalytic activity through compositing with metal compounds; generate H2O2 in situ and reduce the recombination of electron hole pairs through compositing with carbonaceous-based materials. Finally, the development directions of TMS in AOPs in the future are also prospected.