The invention discloses a fingerprint map detecting method of radix astragali drug, intermediate compound and a preparation thereof, the method is as follows: taking onocol as reference substance, obtaining each sample solution through the processes of extracting/ dissolving, determining constant volume and the like, performing HPLC detection under the condition of the same chromatogram, performing gradient elution, recording a chromatogram map, and obtaining the product. In the method, the preliminary treatment method for each sample is simple, the reservation of the characteristic components is complete, the sample solution is stable; the precession is high, reproduction quality is good, and the solution has a certain specificity; the separation effect of each characteristic peak in theobtained fingerprint map is good, the fingerprint map of the radix astragali drug, intermediate compound and the preparation has better correlation; the method can be used for identifying the fake ofthe radix astragali drug, increases the controllability of the production process of the radix astragali preparation, and is in favour of ensuring the quality stability and the clinical healing efficacy of the radix astragali preparation. The invention also discloses a standard fingerprint map of radix astragali drug, intermediate compound and preparation thereof obtained by the fingerprint map detecting method.