The utility model provides an elasticity abrasive disc for cast iron is polished, including abrasive disc base member and the polish line of setting on the abrasive disc base member, this abrasive disc base member is circular shape cymbals column structure, including the installation through -hole that confession grinding device is fixed that is used for the grinding face of polishing and sets up in centre of a circle department, the line of should polishing is including setting up in the grinding face one side and to vertical dimpled grain and horizontal dimpled grain of the inside concave yield of abrasive disc base member, and vertical dimpled grain is parallel to each other perpendicularily and the spaced is covered with whole grinding face, and horizontal dimpled grain parallel just spaced horizontally is covered with whole grinding face, vertical dimpled grain of setting up and horizontal dimpled grain crossing and constitute a plurality of rectangle pieces on the grinding face. The utility model discloses a set up simple structure's rectangle piece on the surface of abrasive disc, can be stretch -proofing with shock resistance, improved chip removal and the heat -sinking capability of abrasive disc when the grinding is polished simultaneously. In addition, adopt the rectangle block structure still to make the abrasive disc have certain pliability, can avoid the work piece of burning, make the grinding operation more swiftly, safer, more laborsaving.