The present invention provides a joint junction box and an electric energy metering box and belongs to the electrical equipment field. The joint junction box is installed in the electric energy metering box; the joint junction box comprises a box body, a cover body, a wiring device and a locking device; in a wiring process, secondary wires or conductors are connected onto wiring blocks through wiring holes; the secondary wires or conductors are pressed by pressing blocks, and at the same time, the wiring holes are blocked through the pressing blocks; and the cover body is locked on the box body through the locking device. Since the wiring holes are blocked, and the cover body is locked on the box body through the locking device, and therefore, the interior of the joint junction box can be isolated from outside space, and electricity stealing behaviors can be effectively prevented; protruding blocks on the pressing blocks extend into the wiring holes, so that the secondary wires or the conductors can be pressed, when the secondary wires or the conductors are pulled and shaken due to the effect of an external force, force bearing points are located in the wiring holes, and therefore, the anti-pulling capability of the secondary wires or the conductors can be enhanced, and the stability of wiring can be improved.