The invention relates to an ultraviolet spectrum analysis identification method for identifying whether fermented cordyceps sinensis fungal powder is mixed in cordyceps sinensis powder or not, and preliminarily judging a mixed ratio. The method comprises the following steps: ultraviolet spectrum scanning is performed by using an adenosine solution, the concentration of which is 12.5 g/ml, as a reference solution at the scanning range of 350-220 nm; whether a sample to be tested has a negative absorption value or not at the range of 275-250 nm is observed, so as to judge whether the fermented cordyceps sinensis fungal powder is mixed in cordyceps sinensis powder or not. Scanning spectra of a cordyceps sinensis pure powder sample, a fermented cordyceps sinensis fungal powder standard substance and cordyceps sinensis samples containing different ratios of the fermented cordyceps sinensis fungal powder standard substances are overlapped to establish a standard model spectrum; the spectrum of the sample to be tested is compared with the established model spectrum, so as to preliminarily judge the ratio of the mixed fermented cordyceps sinensis fungal powder. The identification method provided by the invention has the advantages that few samples are required, the operation is simple and easy, rapid analysis is achieved, a large-sized expensive instrument is not required, the identification result is accurate and reliable and batch identification is achieved.