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This invention relates to a bacterium that degrades chlorobenzene pollutants and its applications. The bacterium is a *Pseudomonas putida* strain, named *Pseudomonas putida* BS-1, deposited at the China Center for Type Culture Collection (CCTCC) with accession number CCTCC M 2024441 on March 11, 2024. Compared with existing technologies, the strain provided by this invention can completely degrade a complex pollutant mixture of dichlorobenzene, chlorobenzene, and benzene within 48 hours. It can survive for a long time and maintain its degradation activity under actual pollution conditions of complex pollution and low temperatures. Furthermore, the functional genes related to the degradation of chlorobenzene pollutants are located on a plasmid, which helps the indigenous bacterium acquire the relevant functions for degrading chlorobenzene pollutants. This strain can be applied to in-situ bioremediation of groundwater with complex chlorobenzene pollution in chemical industrial parks, effectively overcoming the technical shortcomings of traditional reduction dechlorination remediation technologies, which often result in incomplete reduction of products, and achieving green, sustainable, and thorough purification without secondary pollutants.