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This invention discloses an aluminum-cobalt bimetallic ionic liquid-modified biochar catalyst, its preparation method, and its application, belonging to the technical field of water pollution control and environmental functional materials. The method involves mixing an aluminum-cobalt bimetallic ionic liquid with biomass raw materials, followed by one-step or two-step pyrolysis, then cooling, washing, and drying to obtain the aluminum-cobalt bimetallic ionic liquid-modified biochar catalyst. This method eliminates the need for prior preparation of a biochar precursor followed by secondary loading, enabling simultaneous pore formation, nitrogen doping, aluminum-cobalt bimetallic active site construction, and metal-oxygen coordination structure formation of biochar in a single pyrolysis process. The process is simple, and the raw materials are readily available. The resulting catalyst possesses a high specific surface area, abundant surface defects, and stable aluminum-cobalt synergistic active sites, enabling efficient activation of persulfate and rapid degradation of norfloxacin under near-neutral conditions. It also exhibits good anti-interference properties, cycle stability, and potential for practical water body application.