There are a lot of electromagnetic interference in transformer partial discharge signals. In order to extract the characteristic parameters effectively, a variational mode decomposition(VMD) method is proposed to decompose the measured signals into several modes with center frequency fluctuation, and then remove white noise. The modes of transformer partial discharge information are reconstructed, and the periodic interference noise is filtered by independent component analysis (ICA). The feature extraction of the signal is realized. The simulation results verify the effectiveness and good denoising effect of the method.