The invention discloses a loss-of-voltage electric quantity compensation error analysis system for an electric energy meter. The error analysis system is installed at the transformer wire outlet end and includes a three-phase voltage measurement unit, a power supply failure judgment unit, a three-phase unbalance calculation unit, an error search unit, a data storage and transmission unit and a power supply unit. The three-phase voltage measurement unit is used for measuring a three-phase voltage in real time, and a measurement result is used for calculating a negative sequence and zero sequence imbalance; the power supply failure judgment unit evaluates whether a power supply fault occurs by calculating the voltage amplitude of each phase; according to the calculated negative sequence andzero sequence imbalance, the maximum three-phase unbalance is used as a boundary condition, and an electric quantity compensation error is determined by the adoption of an interpolation method throughan error correction table. The quantitative analysis of the loss-of-voltage electric quantity compensation of the electric energy meter is implemented. In work of negotiating and compensating for theloss of electric energy caused by the loss-of-voltage failure of the electric energy meter, the analysis result is used as the electric quantity compensation error reference value to evaluate the compensation for the electric quantity.