Underground hydrogen storage (UHS) has emerged as the optimal solution for large-scale hydrogen storage. In such case, however there is a risk of hydrogen leakage, which, in combination with factors like microorganisms and stress loads present in the underground environment, poses a threat to hydrogen-exposed metallic materials. Hence, the corrosion behavior of J55 steel in a simulated environment of hydrogen leakage in storage facilities with trace hydrogen (0.01%-1%) coupled with sulfate-reducing bacteria (SRB) and the presence stress was assessed via four-point bending method. The results indicate that SRB accelerates the anodic reaction and the corrosion of J55 steel, leading to significant pitting on the steel surface. Moreover, the presence of stress causes stress concentration on the surface of J55 steel, enhancing the localized corrosion induced by SRB, and promoting the development and growth of cracks associated with pit accumulation. When stress, SRB, and hydrogen coexist, an increase in hydrogen concentration in the system (0%, 0.22%, 0.44%) leads to a significant increase in the maximum pitting depth of J55 steel, exacerbating its corrosion. SRB can utilize electrons provided by H₂ to produce corrosive byproducts such as H₂S. The presence of hydrogen further facilitates crack propagation and pit formation.