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The application discloses a detection reagent and a detection method for fermentation power and acid production capacity of Daqu, and relates to the technical field of analysis and detection. The detection reagent comprises a sugar composition and an acid. The sugar composition is composed of glucose, maltose and sucrose, and the mass ratio of the glucose, the maltose and the sucrose is (4-18):(1-5):(0.1-1). The acid is at least one selected from acetic acid and lactic acid. The detection reagent of the application comprises glucose, maltose, sucrose and acid, and the acid is at least one selected from acetic acid and lactic acid. The application simplifies the components of the detection reagent, has the advantages of safe components, controllable safety, strong applicability and wide coverage, and makes the evaluation of the fermentation power and the acid production capacity of Daqu more accurate and efficient.