Combined arc furnace top prefabricated piece

The utility model discloses a combined arc furnace top prefabricated piece. The combined arc furnace top prefabricated piece is composed of a main body area and a vulnerable area which are connected by using fire clay; the contact face of the main body area and the vulnerable area and the axis of the prefabricated piece form a certain included angle; and the prefabricated piece with this structure has good stability and the vulnerable area can be quickly replaced. When the part of the vulnerable area of the traditional arc furnace top prefabricated piece is damaged, the replacement of the entire prefabricated piece is inevitable, thus, the production efficiency is reduced, and heat loss of the electric furnace is generated, and serious waste is caused to the furnace top prefabricated piece. The use of the main body area reaches a limit state by continuous online replacement of the vulnerable area; the combined arc furnace top prefabricated piece of the utility model not only lowers the comprehensive cost, but