The invention discloses a measuring loop device and a measuring achieving method. The measuring loop device comprises an electric energy meter, a merging unit and a current transformer, wherein the current transformer is connected with the merging unit and the electric energy meter and used for collecting electrical quantities of an intelligent substation and inputting the electrical quantities to the merging unit and the electric energy meter; the merging unit is used for performing merging and synchronous processing on the electrical quantities input by the current transformer and forwarding processed digital signals according to a specific format; and the current transformer is used for charging the electrical quantities input by the current transformer. The requirements of conventional metering and an intelligent measurement mode are met simultaneously on the basis that an independent current transformer is not increased.