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This invention discloses a duck-derived recombinant infectious bronchitis virus and its applications, belonging to the field of viral isolation and application. The virus was deposited at the China Center for Type Culture Collection on December 26, 2024, with accession number CCTCC NO: V202503. The duck-derived recombinant infectious bronchitis virus of this invention is capable of infecting CEF and DEF cells, is convenient for in vitro culture, and is suitable for the production of high-quality inactivated vaccines with high antigen titers. The duck-derived recombinant infectious bronchitis virus DIBVSD2401 of this invention has excellent immunogenicity, and the inactivated vaccine prepared using the duck-derived recombinant infectious bronchitis virus DIBVSD2401 of this invention has good safety and excellent protective effect.