The antimicrobial and antioxidant properties of alginate and fucoidan have led to their use as protective coatings in packaging. In this study, the antibacterial and antioxidant activities of alginate, fucoidan, and a mixture of these two extracted from brown algae Sargassum boveanum and Laminaria digitata collected from the Chabahar coast were investigated. In this study, alginate and fucoidan were extracted from brown algae Sargassum and Laminaria through chemical processes in the laboratory. Then, alginate, fucoidan, and combined alginate/fucoidan extracts were produced and their antibacterial and antioxidant properties were evaluated, including measuring total antioxidant activity, iron ion chelating ability, DPPH and superoxide free radical scavenging activity. In the next step, the antibacterial and antioxidant properties of the alginate and fucoidan extracts (treatments 1-2) were statistically compared with the combined alginate/fucoidan extract (treatment 3). The total antioxidant activity of the treatments was measured (231.57±0.9, 282.34±0.6 and 337.6±0.9 mg of ascorbic acid per gram of extract at a concentration of 100), the iron ion chelating ability of the treatments (86.3±0.7, 17.9±0.9 and 93.8±0.6% at a concentration of 2 mg/ml), the free radical scavenging activity of the treatments (17.3±0.9, 26.9±0.1 and 41.02±0.8% at a concentration of 200 μg/ml) and the superoxide treatments (29.3±0.9, 68.9±0.6 and 81.8±0.8% at a concentration of 100 μg/ml) showed that the alginate and fucoidan extracted from these extracts were Algae showed antioxidant activity. The levels of antimicrobial properties, iron ion chelating ability, DPPH and superoxide free radical scavenging activity were significantly different between alginate (T1) and fucoidan (T2) and the combination of alginate and fucoidan (T3). In addition, the combined extract of alginate and fucoidan (T3) had significantly stronger antimicrobial and antioxidant properties compared to treatments 1 and 2. Therefore, the combined extract of alginate and fucoidan can be used as an antibacterial and antioxidant in the food industry.