The invention relates to a GIS point discharge stage judgment method and device based on a maintenance decision purpose. The judgment method comprises the following steps: defining a point discharge severity stage and dividing a discharge fingerprint feature vector; for the discharge fingerprint feature vector obtained in the whole test process, acquiring a clustering center of each discharge stage; extracting a partial discharge feature fingerprint to be diagnosed, and calculating the distance between the partial discharge feature fingerprint and the clustering center of each discharge stage;and judging the distance between the partial discharge feature fingerprint and the clustering center of each discharge stage, and determining the category corresponding to the minimum value of the distance as the discharge stage of a partial discharge phenomenon to be diagnosed. The judgment method and device has the advantages that the design is reasonable; the function of judging the dischargestage and the hazard degree of a GIS point discharge defect is realized; the auxiliary maintenance decision is taken as the purpose; and scientific guiding suggestions are provided for field maintenance decision.