Quality monitoring is a method and activities used by verification /calibration laboratories to ensure its verification/calibration data and results are accurate and reliable. Automatic verification line has been widely used in provincial electric power metering center in production. However, verification quality risks caused by such as poor contact of secondary terminals in automatic verification line is bigger than traditional manual testing apparatus, so effective verification quality monitoring is necessary for low-voltage current transformer automatic verification line. According to the general methods for quality control, this paper proposes a monitoring criterion and method based on multiple error limit of verified current transformer, and experimentally verified this criterion and method. Which ensures test equipment is controllable and in control, test results are accurate and reliable.