Packaging bag supporting device with push-pull plate

A packaging bag supporting device with a push-pull plate comprises four packaging bag supporting arms (22) which are distributed in a rectangular mode and connected to a bottom plate (28), and is characterized in that the push-pull plate (45) and a push-pull plate driving device used for driving the push-pull plate (45) to leave or move to the position above the middle of the four packaging bag supporting arms (22) are arranged beside the positions above the packaging bag supporting arms (22). The plastic bag supporting device has the advantages that in the process that the mechanical arm clamps a layer of plastic bags to move to the position above the packaging bag supporting device, the push-pull plate moves to the position above the packaging bag supporting device to support the plastic bags, and the situation that the plastic bags are scattered is avoided. And through the transverse distance adjusting mechanism and the longitudinal distance adjusting mechanism, the size can be adjusted at will according t