Abstract: Disclosed herein is a robot arm control system of an automated medication dispensing apparatus, which includes a robot arm; a storage configured to store a mounting position of each of a plurality of medication cassettes, an operation control value of the robot arm for moving to the mounting position, and a reference position at which the marker is attached to each medication cassette in a medication cassette storage unit where a plurality of racks in which the plurality of medication cassettes with markers attached thereto are mounted are arranged; a camera configured to capture the marker attached to the medication cassette; and a control unit configured to control the robot arm to move to a mounting position of any one among the medication cassettes to unload the medication cassette.