Traditional　optical　current　transducer　is　based　on　Faraday　Magneto-Optic　effect　and　Malus　law.　Its　light　intensity　detection　mode　has　some　defects　of　small　dynamic　measurement　range,　big　temperature　drift,　and　linear　birefringence.　This　paper　presents　a　new　type　of　optical　current　transducer　based　on　convergent　polarized　light　interference.　It　converts　Faraday　rotation　angle　to　interference　fringe＇s　displacement,　and　uses　linear　CCD　camera　to　capture　the　image　and　calculate　the　displacement.　Magneto-optical　film　is　also　used　to　reduce　the　impact　of　linear　birefringence.　The　experiments　show　the　new　OCT　is　capable　of　measuring　Faraday　rotation　angle　up　to　±64.51°　with　good　linearity,　and　reduces　the　effects　of　linear　birefringence　and　temperature　drift.　©　2015,　The　editorial　office　of　Transaction　of　China　Electrotechnical　Society.　All　right　reserved.