［Objective］ Acrylic resins are the primary binders in current marine antifouling coatings，but their poor degradability poses a potential risk of accumulation in the marine environment.It is necessary to improve the degradation performance of acrylic-based marine antifouling coatings.［Methods］ A series of marine antifouling coatings with excellent degradability were successfullyprepared by physically blending nanocellulose with acrylic resin grafted with 1，2-benzisothiazolin-3-one（BIT）. The resin structure was systematically characterized using infrared spectroscopy. The degradation rates of the coating were measured over 6 months in seawater and soil environments. Thehydrophilicity of the coating was evaluated via water contact angle measurement，and the antifoulingperformance was verified through algal inhibition tests and shallow-sea panel tests.［Results］ The coatings demonstrated excellent degradation performance in both seawater and soil environments. Afterseawater immersion，the water contact angle of these coatings decreased significantly，with a more pronounced reduction observed for coatings containing higher nanocellulose content. The coatings significantly inhibited the growth of two typical marine algae，Chlorella and golden-brown algae，with particularly pronounced inhibition against golden-brown algae. Shallow-sea panel experiments demonstrated that the prepared coatings possess good antifouling performance.［Conclusion］Acrylicresins modified by blending with nanocellulose not only exhibited excellent biodegradability but alsoretained their antifouling properties，demonstrating potential application prospects in the field of marine antifouling coatings.