【Objective】Soil bacterial communities are key drivers of ecosystem functions in facility-based agriculture. However, the regulatory effects of magnetized water (MTW) irrigation on the structure and function of soil bacterial communities under facility cultivation remain unclear. 【Method】In this study, soils from eggplant, cucumber, and pepper cultivation plots were used as research objects. The experimental design comprised irrigation treatments using MTW and non-magnetized water (NMTW). Employing high-throughput sequencing technology combined with functional prediction analysis (FAPROTAX), the study systematically evaluated the impact of MTW irrigation on bacterial community composition, diversity, and key environmental driving factors.【Result】The results demonstrated that MTW irrigation significantly increased the abundances of Proteobacteria and Actinobacteria bacteria in soils of all vegetable cultivation plots by 7.43%-61.94% and 1.95%-11.79%, respectively, while decreasing the abundance of Chloroflexi and Gemmatimonadetes by 3.98%-27.42% and 7.89%-9.62%, respectively. At the genus level, MTW irrigation increased the relative abundance of Streptomyces and Chryseolinea in plot soils across all vegetable cultivation systems. Moreover, alpha diversity analysis showed that MTW irrigation significantly increased the Chao1, ACE, and Shannon indices of bacterial communities in pepper cultivation plots by 21.27%, 26.74%, and 12.22%, respectively, while no significant changes in bacterial community diversity were observed in eggplant and cucumber cultivation plots. Also, the redundancy analysis (RDA) revealed that MTW irrigation altered the environmental factors influencing soil bacterial communities, with soil pH, available phosphorus, and total phosphorus being the key factors regulating the abundance of dominant bacterial phyla. Functional prediction (FAPROTAX) showed that MTW irrigation significantly promoted the enrichment of functional bacteria related to cellulolysis and nitrogen fixation, while reducing the abundance of functional bacteria associated with human pathogens.【Conclusion】This study elucidates the multidimensional impacts of MTW irrigation on soil bacterial communities in facility agriculture systems, specifically addressing compositional, functional, and ecological network characteristics. 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.