The utility model relates to an electric quantity compensation device for hot-line electric energy meter replacement, which has main technical characteristics that the electric quantity compensation device comprises a power supply circuit, an analog channel circuit, an analog-to-digital (A/D) conversion module, a metering processor circuit and a main controller circuit, the power supply circuit is connected with the A/D conversion module, the metering processor circuit and the main controller circuit to respectively supply power to the same, analog circuit channels are connected with an electric energy meter junction box, and the analog circuit channels, the A/D conversion module, the metering processor circuit and the main controller circuit are sequentially connected together. The electric quantity compensation device for hot-line electric energy meter replacement has the advantages that the design is reasonable, the electric quantity which is consumed without being metered by the electric energy meter during the electric energy meter replacement can be accurately recorded when working personnel replaces the electric energy meter on load without cutting off the power, the browsing, enquiring, reporting and printing functions of test results are realized, the electric quantity compensation device can be widely used for three-phase three-wire and three-phase four-wire electric energy meters with current transformers at various voltage grades, the electric quantity loss of an enterprise is effectively avoided and the reasonable and justified electricity transaction between the power enterprise and customers who use electricity is guaranteed.