The invention discloses a standard-deviation-based operating quality trend analysis method for an electric power measurement device. The method comprises: step one, a statistical interval deviation of an operating quality index of an electric power measurement device is calculated; step two, an average statistical interval deviation value of the operating quality index of the electric power measurement device is calculated; step three, an evaluation value of the operating quality index of the electric power measurement device is calculated; and step four, according to a moving average value, a practical value, and an evaluation line value, a trend analysis is carried out on the operating quality of the electric power measurement device. According to the method provided by the invention, the operating quality trend analysis of the electric power measurement device is used as an entry point and characteristics of sudden trend changing, stable operating, and controllable oscillating are introduced, so that the accuracy of the operating quality trend analysis is substantially improved and a clear information support is provided for measurement monitoring. The provided method is an important means for building a high-standard and high-quality electric power measurement device operating state.