No matter how high the manufacturing and assembling precision of the flexographic printing machine is, after a certain period of operation and use, the parts will gradually wear out and even be damaged, and will also be corroded due to the working environment, resulting in a decrease in work efficiency and equipment accuracy, or failure to work. In order to give full play to the working efficiency of the machine, in addition to requiring the operator to use, debug and maintain the machine correctly, it is also necessary to dismantle, inspect, repair or replace some parts regularly or irregularly to restore the machine to its proper precision.