The invention discloses a resistance rotary furnace for chain machining. The resistance rotary furnace for the chain machining comprises a rotary furnace body and a cooling water tank which is arranged under a feeding port of the rotary furnace body; a mounting frame is arranged on the other side, opposite to the rotary furnace body, of the water cooling tank; a feeding box which is higher than the feeding port of the rotary furnace body is arranged on the mounting frame; the feeding box communicates with a feeding pipe which extends towards the feeding port of the rotary furnace body to make a metal component enter the rotary furnace body; a conveying mesh belt of which one end extends into the cooling water tank to separate the metal component from the cooling water tank is arranged on the mounting frame; and a collecting box is arranged under the other end of the conveying mesh belt. The resistance rotary furnace for the chain machining has the following advantages and effects that long-distance feeding of the metal component is realized by utilizing a new mechanical structure and arranging the feeding box and the feeding pipe, so that the rotary furnace body can perform closed quenching, and the quenching quality of the metal component is improved.