A method for controlling a projection device is disclosed, including steps of: receiving a projection instruction, and extracting projection information contained in the projection instruction, the projection information including destination position information and target projection position information; moving the projection device to a destination position in accordance with the destination position information and a predetermined map; and adjusting a projection height and/or a projection angle in accordance with the target projection position information, so as to adjust a projection position of the projection device to a target projection position.