Abstract: Disclosed in the present invention is a recombinant Escherichia coli and application thereof. The recombinant Escherichia coli was deposited on Aug. 28, 2018 in the China General Microbiological Culture Collection Center with the preservation number CGMCC No. 16349. The recombinant Escherichia coli is fermented and cultured, and the concentration of Microcin J25 in the supernatant can reach 4000 mg/L or more.