The work aims to analyze the characteristics of the wrapping mechanism of the flat breakpoint sealing bag (also known as the roll-wrapping bag) packaging machine and design the electrical control circuit of the flat breakpoint sealing bag packaging machine. PLC was used to send the control command to the servo driver which controlled the servo motor. The system's product packaging speed could reach about 4,300 pcs/h. After the system was used for packaging, compared with the artificial packaging, both time and labor were saved, the packaging action was standard and uniform, the packaging position was accurate and aesthetic without folding, and the packaging characteristics were very good. The system successfully solves the problem of artificial packaging flat breakpoint sealing bags, reduces the labor intensity of workers and improves the production efficiency of enterprises.