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Phosphate-Solubilizing Bacteria (PSB) are microorganisms that play an important role in the biochemical cycle of the soil. This paper aims to discuss the role of these bacteria in comprehensive coverage with literature study methods. This bacterium has another role besides solubilizing phosphate in the soil such as suppressing the growth of pathogens for plants, fixing nitrogen to mobilizing heavy metals so that it is not harmful to living things. The mechanism of bacteria in carrying out this role is by secreting organic acids. The group of phosphate solubilizing bacteria varies, such as the Pseudomonas, Burkholderia to Leclercia groups