The invention provides a three-phase electric energy meter. The electric energy meter comprises an ammeter main body and one or more connection lines. The ammeter comprises first wiring terminals. At least one end of each connection line comprises a second wiring terminal. The first wiring terminals are connected or disconnected with the second wiring terminal in a plug-pull manner. According to the invention, by improving the wiring terminals of the ammeter main body and the wiring terminals of the connection lines, the second connection terminals of the connection lines are connected or disconnected with the first wiring terminals of the ammeter main body, so wiring time of installation of an ammeter is greatly reduced, working efficiency of workers is effectively improved and meanwhile, work safety is improved.