Automatic feeding device of marking machine

The utility model relates to the technical field of automatic feeding devices, in particular to an automatic feeding device of a marking machine, which is convenient for a receiving disc to keep a certain resistance when a raw material belt is wound, and avoids the influence on marking caused by bending of the raw material belt due to resistance change. Comprising a base and a marking assembly which is installed at the top end of the base. The device further comprises a driving device, a braking device, a supporting device, a discharging disc, a receiving disc, a first resistance roller and a second damping roller, the discharging disc and the receiving disc are installed on the driving device, the driving device is used for driving the discharging disc and the receiving disc to rotate, and the first resistance roller and the second damping roller are installed on the supporting device. The supporting device is used for driving the second damping roller to ascend and descend, the supporting device is used for