The utility model provides a protector in front of a convertor, comprising an embedded part, an inverted T-shaped channel steel, a fastener and a heat-resisting cast iron member, characterized in that the embedded part is arranged along the length direction of a concrete main girder, the inverted T-shaped channel steel is arranged on the embedded part and is fixed by welding, a bolt is arranged in an inverted T-shaped groove and penetrates through a mounting hole of the 7-shaped heat-resisting cast iron member for covering the bolt, the inverted T-shaped groove and the 7-shaped heat-resisting cast iron member are integrated by a nut. the utility model has the advantages that the concrete main girder can be effectively protected, the protector is high temperature-resistant, bake-resistant and abrasion-resistant, is not easy to break, and has long service life and convenient maintenance and installation due to the decreased maintenance work.