Smelting device and method for preparing iron alloy through direct reduction

The invention provides a smelting device and method for preparing iron alloy through direct reduction, the smelting device comprises a particle refining mechanism, a multi-section metallurgical kiln body and a closed electric furnace body, and the multi-section metallurgical kiln body comprises a plurality of sets of spiral conveyors and electromagnetic induction heating devices; the discharging end of the multi-section metallurgical kiln body is communicated with the closed electric furnace body through a feeding chute and a sealed spiral conveyor, air locking valves are arranged between the multi-section metallurgical kiln body and between the sealed spiral conveyor and the closed electric furnace body and between the sealed spiral conveyor and the feeding chute, and the microwave heating device is used for conducting microwave heating on materials conveyed in the spiral conveyor. Through superposition of the multi-section metallurgical kiln body, multiple external heating modes and atmosphere isolation amo