［Objective/Significance］ Marine biofouling in the waterline area of marine engineering equipment poses a significant challenge，driving the need for novel antifouling technologies. Leveraging the unique light conditions near the waterline，photocatalytic antibacterialantifouling technology has attracted widespread attention for its high efficiency，broad-spectrum sterilization capability，and environmental friendliness.［Analysis/Discussion/Progress］Photocatalyticmaterials exhibit excellent antibacterial and antifouling performance by generating reactive oxygenspecies，inducing cellular oxidative stress，and combining physical/mechanical and photothermal sterilization mechanisms. In this paper，the formation process of marine biofouling and the mechanismsunderlying photocatalytic antibacterial antifouling were systematically reviewed，with a focused discussion on the applications of different types of photocatalytic antibacterial materials in marineantifouling.［Conclusion/Prospect］ Although photocatalytic sterilization and antifouling technologystill faces many challenges before practical application，the continuous development and integration ofemerging technologies are expected to establish it as an efficient，green，and sustainable solution for the controlling marine biofouling.