The invention discloses a device and method for separating an antimony-containing alloy. The device comprises a heating furnace, a cathode melting bath, an anode melting bath, an anode plate provided with openings, a cathode melting bath cover plate, a return pipe, a feeding hopper, an anode bar, a cathode bar, a cathode slag discharging valve, a heat preserving furnace, a heat preserving furnace cover plate, an anode melting bath supporting seat, a cathode bar cooling jacket, an anode bar cooling jacket, a heating furnace movable door and a heat preserving furnace movable door. The method comprises the following steps: melting the antimony-containing alloy, namely preparing a molten salt, adding into the melting baths gradually, heating, adding the antimony-containing alloy after melting of the molten salt, and melting; and (2) electrolyzing the molten salt, namely performing electrolysis by switching on a direct-current power supply, and discharging cathode residues and anode residues respectively after electrolysis. The anode residues can be further chloridized and subjected to displacement reduction to extract metals. The process disclosed by the invention is environment-friendly, the recovery rate of the separated antimony-containing alloy is more than or equal to 99%, and the direct recovery rate of gold and silver in the antimony-containing alloy reaches 99.9%, so that the device and the method are suitable for separating various antimony-containing alloys.