The embodiment of the utility model discloses a current transformer, which comprises a box body, and a first module assembly and a second module assembly which are symmetrically arranged in the box body, wherein the first module assembly comprises a first connecting piece, a first contactor module, a first rectifier module, a first transmission control module, a first inverter module, a second inverter module, a third inverter module, a first output terminal, a second output terminal and a third output terminal; and the second module assembly comprises a second connecting piece, a second contactor module, a second rectifier module, a second transmission control module, a fourth inverter module, a fifth inverter module, a sixth inverter module, a fourth output terminal, a fifth output terminal and a sixth output terminal. The current transformer disclosed by the utility model consists of the first module assembly and the second module assembly which can operate independently. The redundancy performance of the current transformer is improved; in addition, the current transformer consists of modularized components; a complex working process of mounting a large number of discrete components is avoided; and the assembly difficulty is reduced.