The invention discloses a method and system for replacing a standard electric energy meter in a standard electric energy meter group, and belongs to the field of electric energy metering. The method comprises the steps of: constructing a table group 1 and a table group 1'; obtaining an error value of tested meters tested by the standard electric energy meter in the current meter group 1, the standard electric energy meter in the meter group 1' and the standard electric energy meter to be entered or leaved; determining an error prediction value at the next moment of the standard electric energymeter; obtaining a correction value of the standard electric energy meter; obtaining a meter group correction value of the table group 1 and the table group 1'; comparing the correction value of thetable group 1 and the table group 1', taking the standard electric energy meter to be leaved out of the standard electric energy meter group or taking the standard electric energy meter to be enteredinto the standard electric energy meter group. The method and the system for replacing a standard electric energy meter in the standard electric energy meter group can be applied to the standard electric energy meter group built for improving accuracy of the metering standard, when there is an abnormal electric meter in the meter group or a new electric meter is added, In the case of guaranteeingthe accuracy of the standard electric energy meter group, the detection personnel can quickly and directly replace the electric energy meters in the meter group.