?? Patent abstract The present invention relates to the separation apparatus of the envelope and contents to be performed efficiently and the separation of the bag contents by detecting the flowing direction of the envelope is provided. So that the moving direction of the envelope longitudinally, the separation device of the bag and its contents in accordance with an embodiment of the present invention is a transfer device for transporting the envelope; A width detection unit that is disposed upstream of the conveying direction of the envelope than the device; Control unit for receiving information about the width of the envelope from said width detector, and controls the operation of the transfer device; And a. Wherein the control unit, the envelope on the basis of the information coming from the width detection part and that the inlet to the top flaps in the rear or in the bag cover that flows, is determined and the transfer is determined by determining the operation of the system is characterized in that. According to the separation apparatus of the bag and its contents in accordance with the present invention, it is possible to avoid unnecessary operating errors by being designed to operate to maintain a consistent injection direction of the bag, it is possible to reduce the production cost.