The invention discloses an installation shell of a current metering device. The installation shell comprises a shell body, wherein main components of a current metering device are arranged in the shell body. On the basis of the structure, the design of the structure is optimized. A bin gate capable of being opened and closed is arranged on the shell body; a gate lock assembly is arranged on the bin gate; and a lead seal is sealed on the bin gate. The invention also discloses a current metering device assembly. The current metering device assembly comprises a meter, a cable incoming end assembly and a cable outgoing end assembly as well as the installation shell of the current metering device, wherein the meter, the cable incoming end assembly and the cable outgoing end assembly are installed in the installation shell of the current metering device. According to the installation shell, the installation shell of the current metering device is equipped with two anti-sealing-electricity defensive lines, such as the gate lock assembly arranged on the bin gate and the lead sealing sealed on the bin gate, so that the installation shell is difficult to open, and is provided with a reminder of disposable sealing reflection for a sealing-electricity person, thereby effectively avoiding sealing-electricity behaviors.