Precision checking system for mutual inductor

The utility model relates to a checking system, and in particular relates to a precision checking system. The precision checking system comprises a mutual inductor device and a riser and also comprises a mutual inductor checker, a current differential protection device and a switch, wherein the mutual inductor device is connected with the riser; a signal output end of the mutual inductor device is connected with the switch; and the switch is connected with the mutual inductor checker and the current differential protection device. With the adoption of the technical scheme, a sensor device is dually checked through a universal meter and the mutual inductor checker, the check mode is simple, the reliability of the check result can be effectively improved, and the overall safety is ensured.