The invention provides a method for reduced treatment of nickel residue through slag bath. The method comprises: (1) heating nickel residue to a temperature of 1400-1500 DEG C to form a molten slag pool, and then adding aluminum ash; (2) carrying out thermal insulation for 0.5-1.0 h at a temperature of 1400-1500 DEG C, blowing argon, and stirring the molten slag pool; and (3) respectively discharging the liquid-state metal and the tailings, wherein the liquid-state metal is industrial pure molten iron. According to the present invention, with the method, the efficient utilization of the solid waste can be achieved, the high added value industrial pure iron can be obtained, the physical heat carried by the molten nickel residue can be completely utilized, the treatment cost is low, and the environmental pollution is low.