The invention discloses an optical-fiber current transformer device. The optical-fiber current transformer device comprises an optical-fiber current transformer, a merge unit and a state quantity data monitoring module, wherein the optical-fiber current transformer is coupled to the merge unit through a switch state quantity and sample value interface and is coupled to the state quantity data monitoring module through an analog state quantity interface; the merge unit is used for receiving switch state quantity and sample value data from the optical-fiber current transformer and sending the data to the state quantity data monitoring module; the optical-fiber current transformer is used for sending analog state quantity data to the state quantity data monitoring module. By using the optical-fiber current transformer device, the monitoring on the running state quantity of the optical-fiber current transformer can be realized.