Abstract: A HHT-based voltage quality disturbance detection method, including: obtaining frequency spectrum information of an original voltage signal, and determining whether the original voltage signal is a closely spaced mode signal; based on the frequency spectrum information, performing a singular value decomposition on the original voltage signal and performing a reconstruction to obtain a reconstructed voltage signal with an interference signal removed; if the original voltage signal is the closely spaced mode signal, performing a frequency modulation on the reconstructed voltage signal to obtain a frequency-modulated signal; adding white noise to the reconstructed voltage signal or the frequency-modulated signal, and then performing an empirical mode decomposition; and performing a Hilbert transform on each intrinsic mode function obtained by the empirical mode decomposition to obtain an amplitude and frequency information of a corresponding intrinsic mode function.