A method for evaluating harmonic resonance risk of flexible DC converter station, a device and storage medium are provided. By scanning the harmonic impedance of each maintenance mode in the frequencyband of interest, the harmonic impedance amplitude and phase angle of each overhaul mode at each scanning frequency point are obtained, and the maximum and minimum harmonic impedance amplitudes and phase angles of each scanning frequency point and the maximum and minimum harmonic impedance amplitudes and phase angles of each scanning frequency point are calculated, and the harmonic impedance amplitude characteristic region and phase angle characteristic region of the system side are obtained. The harmonic impedance characteristics of flexible DC converter station are calculated, and the amplitude characteristic curve and phase angle characteristic curve of harmonic impedance at converter station side are obtained. Judging the harmonic impedance amplitude characteristic curve of the converter station side and the harmonic impedance amplitude characteristic region of the system side, whether the phase angle characteristic curve of harmonic impedance of converter side coincides with thephase angle characteristic region of harmonic impedance of system side at the same frequency point, in order to determine whether there is harmonic resonance risk at the frequency point, and to realize harmonic resonance risk assessment of flexible DC converter station.