According to the vegetation classification method, the salt marsh tidal wetland in Ordos Plateau was divided into 4 vegetation subtypes, such as succulent salt-tolerant meadow (B), carex meadow (C), grass meadow (D) and forbs meadow (E). meanwhile, salt marsh bare land (A) was taken as the control plot, there are five landscape types of salt marsh tidal wetland designed. The structure characteristics and distribution of soil bacterial community and the relationship between soil salinity and soil bacteria were studied by high-throughput sequencing technique. The results showed that:(1) There were 12213 OTUs in the soil bacteria samples of 5 kinds of salt marsh tidal wetland, which belonged to 2882 species, 1375 genera, 663 families, 365 orders, 122 classes and 45 phyla. (2) Proteobacteria (26.19%) was the highest average relative abundance of salt marsh tidal wetland, followed by Actinobacteria (17.15%), Chloroflexi (12.62%), Gemmatimonadetes (11.23%), Bacteroidetes (9.38%), Acidobacteria (8.83%) and Firmicutes (2.96%); the undetermined bacterium (norank_c_Gemmatimonadetes) in Gemmatimonadetes was the most abundant genus with an average abundance of 5.75%. (3) The community structure of soil bacteria with close spatial positions had a greater similarity from southwest to northeast in Ordos salt marsh tidal wetland. With the change of salt content in soil, the relative abundance of Proteobacteria increased at first and then decreased, which was contrary to the change trend of Deinococcus-Thermus; the relative abundance of Chloroflexi and Acidobacteria showed an increasing trend. Bacteroidetes and Firmicutes generally showed a decreasing trend, and Gemmatimonadetes and Rokubacteria showed a fluctuating and unstable change trend. (4) The abundance and diversity of soil bacterial community in different salt marsh tidal wetlands were as follows:carex meadow > forbs meadow > grass meadow > succulent salt-tolerant meadow > salt marsh bare land. (5) The correlation between soil salinity and bacterial community in Ordos salt marsh tidal wetland from high to low was as follows:TS > CO₃^2-> Na ⁺ > Cl^-> pH > SO₄^2-> K ⁺ > Mg^{2 +} > Ca²⁺> HCO₃^-. The results of this study could not only provide theoretical basis for revealing the composition of soil bacterial flora in salt marsh tidal wetland of Ordos Plateau and the change law of its corresponding environmental characteristics, but also further explored the relationship between soil salinity and soil microorganisms, so as to provide reference for soil remediation and habitat succession in salt marsh areas of Ordos Plateau.