Automatic packaging box bottom cover folding and assembling device

The invention provides an automatic packaging box bottom cover folding and assembling device which comprises a top plate arranged above a workbench, supporting columns are fixedly installed at the four corners of the bottom of the top plate, the bottom ends of the four supporting columns are fixedly connected with the top of the workbench, and a rectangular hole is formed in the top plate; the two supporting pieces are fixedly mounted in two mounting grooves formed in the top plate, the ends, close to each other, of the two supporting pieces extend into rectangular holes in the top plate, and the two supporting pieces are used for stacking and placing packaging boxes to be machined; the bottom of the workbench is provided with a feeding mechanism used for downwards transferring the packaging box on the lowermost layer of the supporting pieces to the machining position. The packaging box bottom cover automatic assembling device has the advantages that automatic feeding and discharging can be achieved, the pack