A simulation apparatus and a simulation method of Double Side Folding and End of Line (DSF&EOL) for secondary battery production are provided. The simulation apparatus includes a memory configured to store at least one instruction and at least one processor configured to execute the at least one instruction stored in the memory, the at least one instruction including instructions for executing an apparatus operating unit including 3D DSF&EOL related to secondary battery production and quality information of a material produced by the 3D DSF&EOL apparatus; executing a facility operating unit including a plurality of adjustment parameters for determining an operation of the 3D DSF&EOL; obtaining at least one of first user action information obtained through the apparatus operating unit or first user condition information obtained through the facility operating unit; determining an operation of the 3D DSF&EOL based on at least one of the obtained first user action information or first user condition information; and double-folding a side wing of a cell related to the 3D DSF&EOL and checking characteristics based on the determined operation.