Device for replacing molten salt in molten salt tank

The utility model relates to the technical field of fused salt replacement, in particular to a device for replacing fused salt in a fused salt tank, which comprises the fused salt tank, a fused salt furnace, an air preheater, a final concentrator and a fused salt switching box, wherein a first fused salt conveying pipeline is communicated between a first liquid outlet of the fused salt tank and a liquid inlet of the fused salt furnace; a second fused salt conveying pipeline is communicated between a liquid outlet of the fused salt furnace and a liquid inlet of the final concentrator, a third fused salt conveying pipeline is communicated between a liquid outlet of the final concentrator and a first liquid inlet of the fused salt tank part, and a fused salt replacement liquid inlet pipeline is communicated between a second liquid outlet of the fused salt tank and a liquid inlet of the fused salt switching box; and a liquid outlet of the fused salt switching box is communicated with a fused salt replacement and