The invention relates to the technical field of partial discharge detection, in particular to a partial discharge detection method based on frequency-division sampling. The partial discharge detectionmethod comprises the following steps of collecting voltage drop at both ends of a partial discharge detection impedance; inputting the voltage drop into an input end of an oscilloscope; setting the sampling rate and triggering conditions of the oscilloscope; displaying a partial discharge pulse signal at the output end of the oscilloscope. The partial discharge detection method has the advantagesthat by setting the sampling rate and triggering conditions of the oscilloscope, the input end of the oscilloscope only collects the occasional partial discharge pulse signal, so as to conveniently summarize and analyze the characteristics of the occasional partial pulse; by setting the sampling rate and triggering conditions of the oscilloscope, the input end of the oscilloscope does not need toalways collect the pulse signal, and the collection is only triggered when the occasion pulse occurs, so that an industrial personal computer with larger memory for always collecting in real time isnot needed, and only one oscilloscope is required, thereby saving the storage space of the collection equipment.