The invention provides a bipolar flexible direct current power transmission system and a current conversion station thereof, and relates to the technical field of electric power. The short-circuit current generated when the direct current side of the bipolar flexible direct current power transmission system fails can be inhibited. The current conversion station used for the bipolar flexible direct current power transmission system comprises a positive polarity current conversion part and a negative polarity current conversion part, wherein the positive polarity current conversion part comprises a first current converter and a first current limiting module; the negative polarity current conversion part comprises a second current converter and a second current limiting module; the first current limiting module comprises a first electric reactor, one end of the first electric reactor is connected with the low voltage end of the first current converter; the other end of the first electric reactor is connected with a neutral bus; the first current limiting module comprises a first electric reactor, one end of the first electric reactor is connected with the low voltage end of the first current converter; the other end of the first electric reactor is connected with a neutral bus.