The invention discloses a 2G3G4G voice quality fault four-domain six-dimensional intelligent delimiting method, which comprises the following steps: 1, establishing four domains for defining poor voice quality and six dimensions for influencing voice call quality, wherein the four domains comprise a core domain, an access network domain, a network transmission domain and an opposite-end domain, the six dimensions comprise a voice MOS value, a dropped call, a crosstalk, a single pass, a swallowing word and a discontinuous call; 2, calculating / evaluating the voice MOS value; 3, performing sliceanalysis on the voice quality, and presenting the voice quality by adopting a visual waveform. By adopting the method, the graph of the voice service quality can be seen, the visualization mode display of the voice fault can be achieved, and the delimiting and positioning of the voice quality can be quickly and effectively achieved.