The present invention provides a partial discharge source location method and device in a transformer, and a server. The method comprises the steps of: collecting electromagnetic wave signals generated by partial discharge in a transformer by employing a plurality of micro-strip omnidirectional antennas arranged on preset positions of the transformer; performing statistics of the two-dimensional statistics matrix of the electromagnetic wave signals collected by each micro-strip omnidirectional antenna; according to the two-dimensional statistics matrixes, determining feature vector matrixes associated with the discharge features; inputting the feature vector matrixes to a pre-training regression model, and outputting distance of each micro-strip omnidirectional antenna and a discharge source; and according to the distances of the micro-strip omnidirectional antennas and the discharge source, determining the position of the partial discharge source in the transformer. According to the relation between the statistical features and the distances of the electromagnetic wave signals, the distance of each micro-strip omnidirectional antenna and the discharge source is determined to achieve location of the partial discharge source, and therefore, the mode can improve the accuracy of the partial discharge source location mode in the transformer.