In order to assess and evaluate the differences of salt tolerance among sunflower germplasm accessions, in this study, 444 sunflower accessions were evaluated for salt tolerance at seed germination and seedling stage with 250 mmol/L NaCl, and salt tolerance experiments were carried out in saline-alkali soil conditions through out the whole growth period. The relative values of germination rate at germination stage, 6 indexes (survival rate, leaf area, plant height, SPAD value, fresh weight of above-ground part and fresh weight of underground part) at seedling stage and 7 indexes (plant height, sunflower diameter, seed setting rate, seed kernel rate, 100 grain weight, grain weight per plant, equivalent yield per 667m2) at whole growth stage were determined, and the salt tolerance was analyzed and evaluated. The results showed that there was a highly significant positive correlation between each two indexes at seedling stage, with correlation coefficients ranging from 0.518-0.790. The correlation between most of the 7 indicators in the whole growth period reached a significant or extremely significant level; Based on these indexes, the analysis of correlation, principal component, membership function value, cluster and comprehensive salt tolerance evaluation were performed, and 132 salt resistant materials at germination stage, 9 at seedling stage, and 41 at whole growth stage were screened. Six accessions ("ZX0365", "ZX0389","ZX1391","ZX1394","ZX3089","ZX3094") showed above salt tolerance grade in the three periods with good comprehensive salt tolerance, which can be utilized for subsequent salt-tolerant gene mining and salt-tolerant variety breeding. The correlation analysis of the salt tolerance grades of these materials at the three stages showed that the identification results of each stage were significantly correlated, indicating that salt tolerance assessments at the seedling and germination stages can serve as effective references for the planting selection of salt-tolerant materials in saline-alkali soil. This study provided method and material basis for the selection of salt-tolerant sunflower varieties.