［Objective］ This study aimed to develop a new resin material combining efficientmarine antifouling performance with stable mechanical properties.［Methods］ A novel copper-containing functional monomer（BIT-copper acetate）was prepared by innovatively combining 1，2-benzisothiazol-3-one（BIT）with a copper compound. Subsequently，through free radical polymerization， the monomer was then grafted at varying contents onto the side chain of acrylic resin to prepare the newBIT-copper acetate resin. The structures of the synthesized monomer and resin were characterizedusing 1H NMR and FT-IR spectroscopy. The antifouling performance was evaluated by algae andbacterial inhibition tests as well as a 60-day real-sea hanging plate test.［Results］The resin exhibited excellent inhibitory effects against three species of algae and two species of bacteria，with a maximum algae inhibition rate of 80% and a bacteriostasis rate close to 100%. The 60-day real-sea hanging plate test confirmed its good antifouling performance in a real marine environment. The optimal foulinginhibition was achieved when the BIT-copper acetate content was around 10%，and no cracking or peeling was observed on the coating surface.［Conclusion］The prepared BIT-copper acetate resindemonstrated both high antifouling efficiency and stable mechanical properties.