Accurate detection of low concentration methanol and ethanol in alcohol is of great importance. Low frequency Raman spectroscopy is one of the most effective methods to study intermolecular dynamics interactions in liquid phase. In this letter, a novel ultra-low frequency Raman spectroscopy was designed for the first time to study ethanol and ethanol methanol mixture with different concentrations. It was found that there were two Raman characteristic peaks at 78cm^-1 and 170cm^-1 for ethanol solution at different concentrations, and two characteristic peaks at 85cm^-1 and 178cm^-1 for ethanol methanol mixture at different concentrations, of which 78cm^-1 and 85cm^-1 were caused byH-OH vibration, while 85cm^-1 and 178cm^-1 were caused byC-OH bond vibration. At the same time, we found the dependence of the above ultra-low frequency Raman peak frequency on the concentration of ethanol and ethanol methanol mixture, which can provide an innovative experimental idea and basis for the accurate identification of lower concentration ethanol and methanol solutions.