【Objective】Soil bacterial communities constitute fundamental drivers underpinning the maintenance of key ecosystem functions within facility agriculture systems. However, the specific regulatory mechanisms and functional outcomes of magnetically treated water (MTW) irrigation on the structural composition and functional dynamics of these soil bacterial communities in protected cultivation environments remain inadequately char-acterized.【Method】 This research investigated soil from cultivation plots of eggplant, cucumber, and pepper. The experimental design comprised irrigation treatments using magnetically treated water and non-magnetized water (NMTW). Employing high-throughput sequencing technology combined with functional prediction analysis (FAPROTAX), the study systematically evaluated the impact of magnetically treated water irrigation on bacterial community composition, diversity, and key environmental driving factors.【Result】Results demon-strated that magnetically treated water irrigation significantly increased the relative abundance of Proteobacteria and Actinobacteria in cultivated soils across all vegetable plots by 7.43%~61.94% and 1.95%~11.79%, respec-tively. Conversely, it decreased the abundance of Chloroflexi and Gemmatimonadetes by 3.98%~27.42% and 7.89%~9.62%, respectively. At the genus level, magnetically treated water irrigation increased the relative abundance of Streptomyces and Chryseolinea in plot soils across all vegetable cultivation systems. Alpha di-versity analysis revealed that magnetically treated water irrigation significantly enhanced the Chao1, ACE, and Shannon indices of bacterial communities in pepper cultivation plots by 21.27%, 26.74%, and 12.22%, re-spectively. No significant changes in these diversity indices were observed in eggplant or cucumber cultivation plots. Redundancy analysis (RDA) demonstrated that magnetically treated water irrigation altered key envi-ronmental drivers of soil bacterial communities, identifying soil pH, available phosphorus (AP), and total phosphorus (TP) as primary factors regulating dominant phylum abundance. Functional annotation further indicated that magnetically treated water irrigation markedly enriched cellulolysis and nitrification-related functional groups while suppressing human pathogen-associated functionalities.【Conclusion】This study elucidates the multidimensional impacts of magnetically treated water irrigation on soil bacterial communities in facility agriculture systems, specifically addressing compositional, functional, and ecological network charac-teristics. The findings establish a theoretical foundation for regulating soil bacterial structure and metabolic functions, optimizing microbial ecological networks, and promoting sustainable soil management in protected cultivation.