Multifunctional high-speed wire online salt bath tank and use method thereof

The invention particularly relates to a multifunctional high-speed online salt bath tank and a using method thereof, and the multifunctional high-speed online salt bath tank comprises an upper bath tank, a lower bath tank, a conveying roller way, a spraying pipeline system, a fused salt pump, a high-temperature salt storage tank, a low-temperature salt storage tank and a fused salt cooling evaporator, the high-temperature salt molten salt pump is communicated with the high-temperature salt spraying pipeline system to form a high-temperature molten salt loop, the low-temperature salt molten salt pump is arranged in the low-temperature salt storage tank and communicated with the low-temperature salt spraying pipeline system to form a low-temperature molten salt loop, and the molten salt cooling evaporator is communicated with the low-temperature salt storage tank through a pipeline. Determining to use the high-temperature molten salt loop, the low-temperature molten salt loop or use the two loops at the same ti