The ecological stoichiometric ratio of carbon, nitrogen, and phosphorus is an important feature of ecosystem processes and functions. In this study, we examined soil stoichiometric characteristics of degraded and undegraded riparian in the Hui River wetland under different flooding conditions, and explored whether soil stoichiometric characteristic can be used to evaluate degeneration of grasslands wetland riparian. Within the riparian area, perennial wetted areas, areas of interannual wet-drying cycles, and dried areas along riparian margins that have not been submerged for many years were selected to study their soil stoichiometric characteristics. The results showed that (1) in both degraded and undegraded grasslands wetland riparian, there were significant differences in soil C/N, C/P, and N/P across the three areas (P < 0.05), (2) in degraded grassland wetland riparian, the average values of C/N, C/P, and N/P were 9.05, 273.08, and 28.25, respectively, which were higher than undegraded grassland wetland riparian (7.85, 95.48, and 11.41, respectively), (3) correlation analysis showed that soil total phosphorus were positively correlated with soil organic carbon and total nitrogen, but negatively correlated with C/N, C/P, and N/P. Soil total phosphorus may be the main factor limiting nutrient cycling in degraded grassland wetland riparian. These results indicate that soil carbon, nitrogen, and phosphorus characteristics, particularly soil C/P and N/P were significantly different among areas of the Hui River wetland under different flooding status in Hulun Buir grassland. Compared with undegraded grassland wetland riparian, degraded grassland wetland riparian showed a significant increase in the values of soil C/N, C/P and N/P. Therefore, the stoichiometric characteristics of soil carbon, nitrogen, and phosphorus can be used as evaluation indices for grassland wetland riparian.