An auto-teaching system for a stocker of the present invention is composed of the stocker including shelves for storing returned goods and a cassette crane loading the returned goods on the shelves using a robot arm or unloading the returned goods from the shelves; a sensor installed on the cassette crane; and mirrors attached on the shelves, separately. The sensor is characterized by automatically studying the return positions or loading positions of the returned goods by sensing the positions of the mirrors attached on the shelves. Therefore, an effect of reducing time required for studying is obtained by automatically studying the return positions or loading positions of the returned goods by the sensor attached on the robot arm or the cassette crane and the mirrors attached on the shelves.
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