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This invention, entitled "A Synergistic Antibacterial Composition and Its Application," belongs to the field of pharmaceutical technology. The technical problem to be solved is to provide a synergistic antibacterial composition and its application, wherein the obtained antibacterial composition has a synergistic inhibitory effect on infection, synergistically inhibiting *Escherichia coli*, *Klebsiella pneumoniae*, carbapenem-resistant *Enterobacter cloacae*, *Pseudomonas aeruginosa*, *Acinetobacter baumannii*, and *Proteus mirabilis*. The key technical points are: the antibacterial composition includes: any one of cefbirol or a cefbirol derivative; and any one of nakubatane or a nakubatane derivative; specifically, according to C... 20 H 22 Based on N8O6S2, the mass ratio of cefbirol or a cefbirol derivative to nakubatane or a nakubatane derivative is 1-4:1-8. The antibacterial composition obtained in this invention is used in the preparation of pharmaceuticals with anti-infection properties.