Method, system and device for detecting voice quality

The invention provides a method, system and device for detecting voice quality. The method comprises the following steps: receiving first voice quality grade messages respectively returned by voice terminals for establishing call connections after each voice terminal carries out voice quality detection on voice paths for bearing call connections; if any first voice quality grade message is detected to be lower than a preset voice quality standard, indicating the voice terminals to respectively perform the voice quality detection on loopback paths between the voice terminals and network elements of a core network; receiving second voice quality grade messages respectively returned by the voice terminals after each voice terminal carries out the voice quality detection on the loopback paths; and according to the second voice quality grade messages, determining fault nodes which cause the voice quality of voice paths to be lower than the voice quality standard. According to the embodiment of the invention, the fault nodes having the quality problem of the voice paths are detected, thus being capable of further optimizing and improving the voice paths aiming at the nodes having the quality problem, thereby improving the voice quality of the voice terminals.