The invention relates to the fields of signal detection and signal processing, and particularly relates to a method for obtaining energy information of a scintillator detector. The method comprises the following steps of, when a ray energy spectrum is measured by using the scintillator detector, collecting pulse signals of N groups of coincident events; according to predetermined high threshold value and low threshold value which are used for obtaining the energy information, carrying out statistics on a difference value of a time point to which the high threshold value belongs and a time point to which the low threshold value belongs in a leading edge time interval of each pulse signal in all the pulse signals; or, carrying out the statistics on the difference value of the time point to which the high threshold value belongs and the time point to which the low threshold value belongs in a trailing edge time interval of each pulse signal in all the pulse signals; processing the difference values of the time points to which the high threshold value belongs and the time points to which the low threshold value belongs, and obtaining an energy spectrogram of the scintillator detector.A circuit is low in complexity; an information processing amount is small; and further, the obtained energy information is accurate.