The invention provides a living current transformer replacement device for a metering cabinet. The living current transformer replacement device comprises: a current transformer chamber including a first current transformer replacement unit and a second current transformer replacement unit arranged laterally side by side, wherein the first current transformer replacement unit and the second current transformer replacement unit each include a short-circuiting vehicle and a current transformer vehicle; the short-circuiting vehicle is disposed directly above the corresponding current transformervehicle; at least one short-circuiting vehicle and current transformer vehicle are connected to a system; and each short-circuiting vehicle includes a first tulip contact, a first contact arm, a short-circuiting copper busbar, a first post insulator, and a first chassis vehicle. The current transformer can be replaced without power outage by disposing two current transformer replacement units on the metering cabinet, thereby avoiding the economic loss caused by the power outage, greatly reducing the operation processes of a power supply company for replacing the operating current transformer,and further improving the automation level of the power system and the power supply reliability of the power system.