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Microbial biocontrol agents are efficient and environment-friendly in eradicating plant pathogenic bacteria. In recent years, Bacillus velezensis has gained popularity as a potential biocontrol agent in many countries. Several B. velezensis-based biocontrol products, previously identified as B. amyloliquefaciens or B. amyloliquefaciens subsp. plantarum, have received commercial approval, particularly in China and Europe. In this study, we compiled recent research findings on B. velezensis related to the production of antimicrobials, volatile organic compounds, induction of disease resistance, and the effect of this bacterium on plant growth promotion and yield. However, some recent research indicates that this important resource is also linked to several diseases in crops, including peach, onion, and potato, and the negative aspects of this bacterium in terms of its virulence traits to infect crops have not been summarized before. In this review, we compile the recent reports of this bacterium in term of its beneficial properties in agriculture. In addition, we also discuss several reports about its harmful effect on several crops as well. Therefore, due to the inherent pathogenicity of this bacterium to several crops, care must be taken when using it in a novel crop cultivation technique. [ABSTRACT FROM AUTHOR]