The invention discloses a fingerprint spectrum detection technology of ginger essential oil. In the detection of the ginger essential oil, n-hexane is taken as a diluting solvent, a coupling chromatograph is adopted for detection, a PDA (photo-diode array) detector is adopted for measurement, a PDA spectrogram database of a characteristic peak is established, and a standard control fingerprint spectrum of the ginger essential oil is established. The fingerprint spectrum detection technology comprises the following steps: extracting a PDA spectrogram of a chromatographic peak and the spectrogram database of the characteristic peak in a coupling chromatograph fingerprint spectrum of to-be-detected ginger essential oil for search and comparison, and identifying a common characteristic peak; estimating similarity to the standard control fingerprint spectrum of the ginger essential oil with an included angle cosine method; when the similarity is more than or equal to 0.90, determining thatthe to-be-detected ginger essential oil is pure ginger essential oil; and when the similarity is less than 0.90, determining that the to-be-detected ginger essential oil is not pure ginger essential oil. According to the detection technology, the ginger essential oil can be rapidly and effectively identified, and therefore, the detection technology has certain significance for quality control of peppermint essential oil and adulteration identification.