Disclosed are a detecting device, and a method for controlling the same, and the detecting device includes: a controller, and a detector and at least one image acquirer which are electrically connected respectively with the controller, wherein the detector includes a receiver; the image acquirer is arranged on a side of the detector away from the receiver and has an adjustable shooting angle; and the controller is configured to control the image acquirer to acquire images of at least two adjacent sides of a detected rectangular plane, and to determine the position of the detector on the detected rectangular plane according to the shooting angle of the image acquirer and the acquired images of the sides.