This study investigates the impact of salt stress on the root-associated microbiota of wild soybean (*Glycine soja*) and the underlying mechanisms. Salt stress significantly affected plant growth, reducing root length, plant height, leaf size, and root and shoot fresh weights. The root and rhizosphere microbiota were analyzed using 16S rRNA gene amplicon, metagenomic, and metatranscriptomic sequencing. Results showed that salt stress enriched *Pseudomonas* in the root and rhizosphere, with two *Pseudomonas* isolates (XN05-1 and YE17) enhancing wild soybean growth under salt stress. Metagenomic and metatranscriptomic analyses revealed that motility-associated genes, particularly chemotaxis and flagellar assembly, were significantly enriched and expressed in salt-treated samples. Roots of salt-stressed plants secreted purines, especially xanthine, which induced the motility of *Pseudomonas* isolates. Exogenous application of xanthine to non-stressed plants also enriched *Pseudomonas*, reproducing the microbiota shift in salt-stressed roots. Pseudomonas mutant analysis indicated that the motility-related gene *cheW* is essential for chemotaxis toward xanthine and enhancing plant salt tolerance. The study concludes that wild soybean recruits beneficial *Pseudomonas* species by exuding key metabolites (purines) to counteract salt stress.This study investigates the impact of salt stress on the root-associated microbiota of wild soybean (*Glycine soja*) and the underlying mechanisms. Salt stress significantly affected plant growth, reducing root length, plant height, leaf size, and root and shoot fresh weights. The root and rhizosphere microbiota were analyzed using 16S rRNA gene amplicon, metagenomic, and metatranscriptomic sequencing. Results showed that salt stress enriched *Pseudomonas* in the root and rhizosphere, with two *Pseudomonas* isolates (XN05-1 and YE17) enhancing wild soybean growth under salt stress. Metagenomic and metatranscriptomic analyses revealed that motility-associated genes, particularly chemotaxis and flagellar assembly, were significantly enriched and expressed in salt-treated samples. Roots of salt-stressed plants secreted purines, especially xanthine, which induced the motility of *Pseudomonas* isolates. Exogenous application of xanthine to non-stressed plants also enriched *Pseudomonas*, reproducing the microbiota shift in salt-stressed roots. Pseudomonas mutant analysis indicated that the motility-related gene *cheW* is essential for chemotaxis toward xanthine and enhancing plant salt tolerance. The study concludes that wild soybean recruits beneficial *Pseudomonas* species by exuding key metabolites (purines) to counteract salt stress.