Error monitoring method and system for direct current measuring device

The invention discloses an error monitoring method and system for a direct current measuring device. The method comprises the following steps: analyzing the structure of a direct current measuring device and a measuring point setting mode; setting error monitoring indexes hierarchically and formulating a monitoring strategy; obtaining measurement data of the direct current measurement device at each measurement point; performing error monitoring calculation on the direct current measuring device according to the formulated monitoring strategy; evaluating the error of the direct current measuring device; and estimating the error of the direct current measuring device. The current direct current measuring device is not changed, and only a small amount of additional equipment is added, so that real-time monitoring and quantitative evaluation of the accuracy of the direct current measuring device running on line can be realized, deterioration of the accuracy can be timely found, sensed in advance and warned, and