Metering box of triphase electric energy meter, and test system

The invention discloses a metering box of a triphase electric energy meter, and a test system, and belong to the technical field of the metering box of the electric energy meter. The metering box comprises a box body and an electric energy meter fixedly arranged in the box body; an incoming line terminal of the electric energy meter is electrically connected with an isolating switch, an outgoing line terminal of the electric energy meter is electrically connected with a circuit breaker; a socket is arranged on an outer wall of the box body; the socket comprises multiple wiring terminals; the socket is electrically connected N-phase incoming line terminal and A-phase incoming line terminal, a B-phase incoming line terminal or C-phase incoming line terminal of the isolating switch through the wiring terminals and connected with various outgoing line terminals of the circuit breaker, and electrically connected with a feedback terminal and a control terminal of a control cable plug of thecircuit breaker. The desi