the present invention belongs to the technical field of lithium ion battery production equipment , and particularly relates to a double - folding device for softly - packaged lithium ion batteries , comprising a rack , and a loaded - material positioning mechanism , a primary folding mechanism and a secondary folding mechanism which are arranged on the rack in turn . a bonding layer arrangement mechanism is further provided between the primary folding mechanism and the secondary folding mechanism . in comparison to the prior art , in the present invention , by providing , between the primary folding mechanism and the secondary folding mechanism , a bonding layer arrangement mechanism which is configured as a mechanism capable of online monitoring the arrangement of a bonding layer and automatically adjusting the glue dispensing position and glue volume , the real - time adjustment of the dispensing position and volume of glue is realized .