The invention discloses a low-temperature fused salt electrolytic cleaning metallurgy method and device for bismuth. The method comprises the following steps: mixing a bismuth-containing material withinertia fused salt, putting the mixture into a low-temperature fused salt electrolysis device in a certain material distribution manner, and performing low-temperature fused salt electrolytic smelting under certain temperature and pulse current conditions; and along with low-temperature fused salt electrolysis, gradually forming a "three-layer melt" structure by the mixed fused salt in a furnacehearth, wherein the bismuth-containing material can be continuously added from a feeding port, and obtained liquid bismuth can be discharged from a lower bismuth discharging port. According to the low-temperature fused salt electrolytic cleaning metallurgy method, the treatment temperature of an existing bismuth concentrate pyrogenic process is substantially reduced; high-quality bismuth can be produced by one step; and compared with a smelting process of the existing bismuth concentrate pyrogenic process, the low-temperature fused salt electrolytic cleaning metallurgy method has the advantages of low energy consumption and high direct bismuth recovery rate. The device disclosed by the invention is simple and practical; and by cooperative use, the device can achieve a good bismuth extraction metallurgy effect.