The present invention relates to an SPC (statistical process control)-based electric energy meter comprehensive error process capability evaluation method. According to the method, process capabilityindexes CPK and PPK are introduced into an error analysis process; the process capability indexes of each different load error point are calculated, and weighted calculation is performed according tothe weight coefficients of different loads, and therefore, the comprehensive error monitoring index of an electric energy meter can be determined; parameters which characterize single-phase smart electric energy meter comprehensive error distribution features are researched; the distribution law of smart electric energy meter output feature parameters are calculated finally; daily verification data analysis is reinforced, and the quality of batch products is controlled. An SPC-based comprehensive quality control mechanism is built for electric energy meter comprehensive error; the SPC technology is applied to electric energy meter comprehensive error process capability evaluation; random factors and abnormal factors that affect the quality of a teaching mode can be reasonably differentiated; an electric energy meter error verification process is always in a statistically controlled state; and the error level of a metering device can be under effective control.