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The application provides a fusion protein for antibody site-specific coupling and application thereof. The fusion protein of the application is mainly fused by an antibody Fc affinity protein binding monomer and an avidin protein, realizes direct coupling of the antibody Fc affinity protein and a biotin-labeled molecule, and no longer uses a click chemistry scheme, so that the production and use difficulty of the antibody Fc affinity protein Protein G is greatly simplified, the Protein G protein no longer needs to be activated through the click chemistry in the production, the transportation and storage conditions no longer need to be strictly controlled, and even one-step antibody molecule coupling can be realized.