Novel steel bar cathode structure

The utility model discloses a novel steel bar cathode structure which comprises a carbon column and a conductive metal piece, the carbon column is connected with the conductive metal piece, the carbon column is in a rectangular column shape, a penetrating groove is formed in the top end of the carbon column in the length direction of the carbon column, and the inner side walls of the two sides, in the width direction, of the penetrating groove are arranged in an arc shape bent towards the interior of the penetrating groove; the number of the conductive metal pieces is two, the two conductive metal pieces are embedded in the two ends of the penetrating groove respectively, and a fixing gap is formed between the ends of the two conductive metal pieces. Two clamping grooves are symmetrically formed in the bottom end of the interior of the penetrating groove, the two clamping grooves correspond to the two conductive metal pieces correspondingly, and the clamping grooves are connected with vertical protrusions arr