The present invention relates to a method and device for determining the defect type of a partial discharge, the method comprising the steps of: forming virtual spaces corresponding to n parameters generated on the basis of defect types that cause a partial discharge; arranging defect type models in the virtual spaces based on the parameter values of the n parameters; extracting parameter values of the n parameters based on a partial discharge event; arranging a partial discharge model in the virtual space based on the parameter values; calculating the distance value between the defect type models and the partial discharge model based on the position information of the defect type models and the partial discharge model; calculating the probability of the defect types based on the calculated distance value; and determining the defect type based on the probability of the defect types for the partial discharge signal event.
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