During the printing process of the Central Drum Flexo Printing Machine, due to the high printing speed, one roll of material can be printed in a short period of time. In this way, refilling and refilling is more frequent, and the downtime required for refilling is relatively increased. It directly affects the production efficiency of the printing press, and also increases material waste and printing waste rate. In order to improve the production efficiency of the flexographic printing machine, the Central Drum Flexo Printing Machine generally adopts the method of changing the reel without stopping the machine.