Salt stress severely limits crop productivity, yet in mung bean ( Vigna radiata), a legume of agronomic and nutritional importance, the transcriptional basis of dose-dependent salt adaptation remains unexplored. Here, we combined physiological assays, transcriptomic profiling, and a time-ordered gene co-expression network to dissect the regulatory responses of mung bean under a gradient of NaCl concentrations. Salt exposure elevated reactive oxygen species and osmolyte levels, accompanied by transcriptional reprogramming that intensified with salinity. The network analysis revealed eight hierarchically organized regulatory layers corresponding to distinct salt stress stages, with coordinated activation of ethylene and jasmonic acid signaling. Notably, lipid transfer proteins were predominantly activated under high-salt conditions and co-expressed with key transcription factors including WRKY, MYB, and NAC. These findings illuminate a multi-tiered regulatory framework integrating hormonal signaling and lipid-mediated defense, providing new insights into plant adaptive strategies across salt stress intensities.