In view of the efects of different chelating agent ratios on tailings soil properties, plant growth indexes and their correlation, a pot experiment was carried out by using IDS and EDTA chelating agents combined with Afrua pseudoacacia to remediate heavy metals in tailings soil. The results show that the plant height, main root length and rhizome of Amorpha fruticosa decrease first and then increase under different chelating agents ratios. The inhibition effect of EDTA alone is stronger than that of IDS alone, and appropriately adjusting the mixing ratio of IDS and EDTA can promote plant growth. Single IDS can inhibit the conductivity, while single EDTA, or IDS mixed with EDTA can promote the conductivity. The Cu content is the highest in the control group (water culture). The single IDS significantly promotes the Cu content, and either single factor treatment or the mixed treatment of IDS and EDTA inhibit the contents of Pb and Zn. Soil organic matter content is negatively correlated with plant  growth indexes, while electrical conductivity is positively correlated with plant growth indexes. Soil electrical conductivity is highly correlated with plant rhizome. There was no significant negative correlation between soil pH and plant growth index. The plant growth index has a high positive correlation with the content of Cu and Zn, but the influence of Pb content on the plant growth index is not obvious.