Multi-stage extension device for ultra-wide lithium strip

The invention discloses a multi-stage extension device for an ultra-wide lithium strip. The multi-stage extension device comprises an unwinding group, a lubricating part, an extension part, an edge cutting mechanism and a cleaning and drying part, the unwinding group comprises an unwinding roller and an unwinding auxiliary mechanism and is used for unwinding and feeding an original lithium strip; the lubricating part is arranged at one end of the unwinding group and is used for synchronously lubricating the upper and lower surfaces of the lithium strip; the extension part is arranged at the discharge end of the lubricating part and is used for applying pressure to the lithium strip to realize multi-stage extension; the edge cutting mechanism is arranged at the discharging end of the extension part and is used for cutting off redundant parts on the two side edges of the lithium strip; and the cleaning and drying part is arranged at the discharging end of the edge cutting mechanism and is used for removing and