It was focused on the automatic vertical bag forming-filling-sealing machine (packaging machine for short) and the exploring the relationship between its stability and action sequence in this study. Therefore, it was concluded that three important factors contributed to restricting the speed of the packaging machine, including the transverse sealing, the filling, and the carrying film action time. Moreover, a specific measure of improving the packaging speed was proposed, i.e., designing faster transverse sealing driving mechanism and adding a guide plate above the transverse sealing, trying to keep the bulk product dropping together, and changing the general motor to servo motor and etc. Through some practical applications, it was proved that in the premise of guaranteeing the stability of the packaging machine, the packaging speed could be increased by more than 20%.