High salinity levels and soil health are critical issues in modern agriculture. This study investigated the effects of Bacillus subtilis, Bacillus megaterium, Bacillus cereus, and Bacillus thuringiensis on Arabidopsis thaliana under high salinity conditions. B. thuringiensis exhibited the most significant positive impact, demonstrating high germination rates, extended lifespans, and substantial growth. It mitigated stress responses in Arabidopsis thaliana, thereby enhancing plant health.