The utility model provides a heavy -calibre ball core vacuum is melted and is covered dress card structure, including graphite bottom plate, axle sleeve and rod iron, the at least three rod iron of circumference equipartition in the metering orifice of ball core, the axle sleeve is located on the graphite bottom plate, ball core cover is established on the axle sleeve, just axle sleeve upper end with the rod iron is connected. The utility model provides a pair of heavy -calibre ball core vacuum is melted and is covered dress card structure, can be fine utilize the effective zone of heating in the furnace because the auxiliary fixtures who uses is little, so the heat utilization efficiency of part is very high, moreover because unsettled the placing of the vertical direction of ball core flow channel hole, the deflection of ball core in the reduction heating process that can be fine.