Microbial exopolysaccharides have been extensively explored due to their distinctive structural features and physiological activities, making them suitable for diverse applications in the food and environmental applications. Current studies mainly focus on the structural and functional characterization of exopolysaccharides from known strains, with limited exploration of novel strains. In this study, a novel exopolysaccharide was produced by Gelidibacter sp. PG-2 with a yield of 874 mg·L