A bag feeding mechanism of a packaging machine includes a rack and a bag sending slide, characterized in that the bag feeding mechanism of the packaging machine further includes a rear slide pushing mechanism disposed at the rear end of the rack and a front of the rack. Slide pushing mechanism. The front slide pushing mechanism includes a front lifting cylinder fixed on a rack above the bag sending slide, a front positioning rod connected with the front lifting cylinder, and a front driving cylinder. The front driving cylinder is fixed at the front end of the rack and the driving rod thereof The end is fixed on the front positioning rod. The rear slide urging mechanism comprises a rear lift cylinder fixed on a frame above the bag feeding slideway, a rear positioning rod and a rear drive cylinder connected with the rear lift cylinder, and the rear drive cylinder is fixed at the rear end of the rack and drives the same. The rod end is fixed on the rear positioning rod. The rack is also provided with a plurality of proximity switches corresponding to the front lift cylinders or the rear lift cylinders, and the contact heads of the proximity switches are arranged on the motion paths of the corresponding cylinders. There is also a clamping mechanism at the front of the rack.
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