The utility model discloses a metering wiring box capable of solving problems of wire release and wire break when wiring effectively and guaranteeing the safety operation of an electric power circuit. The metering wiring box includes a box body, a box cover, conducting sheets and a locking mechanism. The inner space of the box body is divided into a plurality of wiring cavities through longitudinal separation boards. The center of the wiring cavities are provided with bosses. Hinged supports are arranged on the left side faces and the right side faces of the front and rear parts of the wiring cavities respectively in a corresponding manner. Wiring holes corresponding to the wiring cavities are arranged in the front side face and the rear side face of the box body respectively. Sleeve holes fitted with the bosses are arranged in the centers of the conducting sheets. The conducting sheets are disposed in the bottom parts of the wiring cavities respectively in a one-to-one corresponding manner. The locking mechanism includes brake valves, spring and blocking boards. The brake valves include press handles, valve blocks and hinge shafts. The brake valves are installed on the front and rear parts of the wiring cavities of the box body. The springs are embedded between the press handles and the bosses. The front parts and the rear parts of the blocking boards are provided with press handle holes that are corresponding to the press handles of the brake valve respectively. Centers of the blocking boards are installed on the bosses through screws.