The utility model relates to an infinity smelting furnace. The infinity smelting furnace comprises a furnace bed, a reducing hearth, an oxidizing hearth and a transferrer, the reducing hearth and the oxidizing hearth are symmetrically arranged on the furnace bed, the transferrer is arranged between the two hearths, and the two hearths are respectively connected with the transferrer through material transfer passages. The level of the passage connected with the reducing hearth is higher than the level of the passage connected with the oxidizing hearth, the tops of the two hearths are connected with flues, the two hearths are respectively provided with a slag discharge hole and a sulphonium or metal discharge hole, the position of the horizontal central line of the slag discharge hole of the oxidizing hearth is higher than the position of the horizontal central line of the passage connected with the reducing hearth, the position of the horizontal central line of the slag discharge hole of the reducing hearth is lower than the lower edge of the passage connected with the reducing hearth, and the tops of the two hearths are respectively provided with a feed inlet and a spray lance socket. The infinity smelting furnace is integrated with oxidizing operation and reducing operation, and has the advantages of simple structure, short flow, low energy consumption, little investment and good operation environment. The infinity smelting furnace can be widely applied to the smelting of copper, nickel and lead.