An oxide composite hydrogen barrier coating was fabricated on 316L stainless steel via the sintering method, mainly composed of α-Al₂O₃/Cr₂O₃/SiO₂. The influences of sintering temperature and slurry mass ratio on the macroscopic morphology of the coating were investigated. The microstructure analysis, hydrogen barrier performance, and thermal shock resistance of the coating were also examined. The findings reveal that when the sintering temperature is 725 ℃, and the slurry mass ratio is 1∶5, the surface of the coating is smooth, the number of pores and cracks is small, and the morphology is uniform, with an average thickness of approximately 64 μm. The composition phases of the coating are α-Al₂O₃, Cr₂O₃, and SiO₂, in which α-Al₂O₃ and SiO₂ are layered and unevenly distributed within the coating, while Cr₂O₃ is uniformly distributed in the coating. The obtained oxide composite hydrogen barrier coating exhibits excellent hydrogen barrier performance, with a reduction factor 15.3 compared to 316L stainless steel, and capable of withstanding 20 times thermal cycles at 450 ℃.