Combined all-fiber current measurement system and current measurement method

The invention provides a combined all-fiber current measurement system and a current measurement method, the system comprises a data processing device and two or more than two different all-fiber current measurement devices, and the all-fiber current measurement devices are connected to the data processing device; the all-fiber current measurement device is used for measuring current and comprisesa light source, a coupler, a linearly polarized light conversion module, a circularly polarized light conversion module, a detector and a data processing module, the circularly polarized light conversion module is used for converting the linearly polarized light obtained by the linearly polarized light conversion module into circularly polarized light and deflecting the circularly polarized light; the detector is used for detecting the linearly polarized light; the data processing module is used for processing the data obtained by the detector to obtain current data; and the data processing device processes the curre