The utility model discloses a reserve digital electric energy meter of check -up interface, control the unit including the digital electricity meter that is provided with electric energy meter termination mouth with reserve the check -up interface, miniature fiber optic conversion ware, first, second way light signal interface, miniature switch, check gauge and station, first via light signal interface and miniature fiber optic conversion ware and electric energy meter end interface connection, electric energy meter termination mouth and miniature fiber optic conversion ware and reservation check -up interface connection, it is connected with the check gauge to reserve the check -up interface, data processing module is connected with miniature fiber optic conversion ware, the utility model provides a reserve digital electric energy meter of check -up interface has overcome present calibration equipment's check -up drawback, and through signal of voltage and current transmission to the check -up interface of reserving of drawing merging cells, rethread fiber optic conversion ware transmits the check gauge to, realizes the on -the -spot error examination of not stopping transport of digital electric energy meter, has avoided losing the signal during the digital electricity meter validation process and stops the first astronautic research institute for measurement and test and lead to the fact the metering loss.