The invention discloses a global-and-local-feature-combined current transformer saturation detection method, which comprises the following steps: if meeting emergency variable startup judging criteria, entering the saturation detection step immediately; calculating harmonic ratio alpha of secondary current waveform within a period starting from an extreme point; calculating integral areas of equal four sections of waveforms of secondary current of a current transformer within the period starting from the extreme point after fault starts and calculating the ratio Sc of the maximum area and the minimum area; comparing the obtained ratio Sc and the harmonic ratio alpha with corresponding preset threshold values respectively, and when both the ratio Sc and the harmonic ratio alpha are larger than the preset threshold values, judging that the current transformer enters a saturation state; and when detecting saturation, carrying out comprehensive analysis on the calculating results of the waveform area ratio and the harmonic ratio immediately to obtain exact saturation degree. The method retains the sensitivity of harmonic ratio to mild saturation, and meanwhile, can also use the ratio of sectional integrals to better reflect the degree of saturation; and through combination of the two modes, the method is allowed to be high in sensitivity and improves identification efficiency.