Broomcorn millet is recognized as a pioneer crop for saline-alkali lands due to its resilience in drought and barrenness. This study conducted a comprehensive assessment of salt tolerance in 523 domestic and international broomcorn millet （Panicum miliaceum L.） germplasm accessions at the seedling stage using a hydroponic system with 160 mmol/L NaCl. Under salt stress conditions， several morphological traits exhibited significant variation （applying salt tolerance coefficient below the lower quartile value of 0.65）. These traits included plant moisture content， stem moisture content， leaf surface area， root moisture content， total root length with a root diameter less than 0.2 mm and total root length with a root diameter above 0.5 mm. Correlation analysis further revealed that the salt tolerance coefficient of plant dry weight and plant moisture content are significantly positively correlated with the total root length， total root length with a diameter less 0.2 mm， and total root length with a diameter between 0.2~0.5 mm. In contrast， the salt tolerance coefficient of stem dry weight was significantly negatively correlated with the root dry weight， root moisture content and total root length. Principal component analysis extracted seven principal components， collectively accounted for 85.198% of the total variance. The first and third principal components were predominantly composed of salt tolerance coefficient of root diameter and root surface area， respectively. The comprehensive evaluation values of salt tolerance （D-value） followed a normal distribution， ranging from 0.291 to 0.654. The germplasm resources from Ningxia （0.493）， Qinghai （0.483） and Xinjiang （0.477） generally exhibited higher D-value than those from other regions， while germplasm resources from Shanxi （16.08%）， Gansu （17.34%） and Inner Mongolia （15.97%） showed higher coefficient of variation. These accessions were classified into five grades based on membership function analysis， including 59 highly salt-tolerant germplasm resources （11.28%， D=0.532~0.654）， 40 moderately salt-tolerant germplasm resources （7.65%， D=0.510~0.531）， 69 salt-tolerant germplasm resources （13.19%， D=0.481~0.509）， 132 moderately salt-sensitive germplasm resources （25.24%， D=0.439~0.480） and 223 categorized as highly salt-sensitive germplasm resources （42.64%， D=0.291~0.438）. Through stepwise regression analysis， a salt tolerance evaluation model with an accuracy of 93.55% was established， the key indicators for salt tolerance evaluation of broomcorn millet seedlings were determined to be total root length， plant dry weight， ratio of lateral root angle 30~60°， stem moisture content， total root length with a diameter below 0.2 mm and total root length with a diameter above 0.5 mm.