The invention discloses a nuclear well logging detector signal processing method and device, and belongs to the electric signal processing field; the method comprises the following steps: collecting electric pulse signal waveform in the nuclear well logging detector in real time; obtaining a time interval between the present peak and an adjacent previous peak in the waveform; comparing the time interval with a preset time interval threshold; recording present peak information if the time interval is bigger than or equal to the time interval threshold; neglecting the present peak information if the time interval is smaller than the time interval threshold. The device comprises an acquisition module, an obtaining module and a processing module; the method and device only record the present peak information when the time interval is bigger than or equal to the time interval threshold, so stacked nuclear well detector signals can be abundant and effectively distinguished, thus improving precision of the obtained nuclear well logging detector signal information.