Provided are an automatic tablet dispenser of an automatic medicine packing machine, and a tablet supply method thereof, which are capable of automatically packing various-shaped tablets, and accurately, cleanly and rapidly distributing the tablets without missing any. The automatic table dispenser which is installed in a medicine packing machine for automatically packing tablets, includes: a body including a space for containing the tablets therein and a guide track for guiding the tablets contained in the space upward from a bottom of the body; and a driver vibrating the body so that the tablets contained in the space of the body are transferred upward along the guide track.