An olive oil fast detection method adopting the signal intensity ratio of Raman spectrum characteristic peak comprises: scanning a test sample via a Raman spectrometer; attaining the Raman spectrometric chart of flat baseline via software; using the intensity of the peak corresponding to 1441cm<-1> wavelength as unit 1, to do spectra graph normalization; using the intensity ratio between the peak of 1265cm<-1> wavelength and the peak of 1441cm<-1> wavelength as horizontal coordinate and using the intensity ratio between the peak of 1265cm<-1> wavelength and the peak of 1441cm<-1> wavelength as longitudinal coordinate to draw chart, thereby calibrating the coordinates of the sample; using the longitudinal coordinate of 0.7 line as a boundary line for dividing real and false olive oils. The invention realizes fast, non-loss, low-cost and in-situ identification on real and false olive oils, and realizes in-situ and fast identification on the olive oil added with other different oils and the olive oils of different levels. The olive oil fast detection method has simple operation interface, and can visually distinguish olive oil from soybean oil, sunflower oil, rapeseed oil, corn oil, peanut oil and false olive oil.