Reducing paper cutting device for paper bag production

The diameter-variable paper cutting device for paper bag production comprises a machine base, a cutting roller, a cutting mechanism and a diameter-variable mechanism, the cutting mechanism comprises a cutter assembly arranged on the periphery of the cutting roller, and a telescopic assembly is connected between the cutter assembly and the cutting roller; the reducing mechanism comprises a middle shaft, an adjusting nut, a first locking assembly and a second locking assembly, the middle shaft is slidably arranged in the cutting roller in the axial direction, the middle shaft is provided with a driving thread section, the adjusting nut is rotationally installed on the machine base, the driving thread section is sleeved with the adjusting nut in a threaded mode, and the middle shaft is in transmission connection with the telescopic assembly; the middle shaft is used for driving the telescopic assembly to stretch out and draw back so as to drive the cutter assembly to adjust and move in the radial direction of th