The present invention discloses a chord changing processing method and device. The method comprises: firstly, selecting target music to be changed in chord; secondly, determining the chord to be changed in the target music and a changed target chord; and finally, converting the chord to be changed to the target chord according to a preset chord changing relation. According to the technical scheme, professional music persons or ordinary people may convert chords of any music to other random chords, and the process of automatically changing chords may be realized, therefore the changing process is simplified and the time cost is reduced.