The invention discloses a detection ball, and the detection ball comprises a vital sign detection module which is used for detecting whether there is an object with vital signs in a preset detection range or not, and transmitting a first instruction to an image collection module if the object is determined to exist; the image collection module which is used for image collection after the first instruction is received, and is also used for transmitting the collected image to a recognition module; the recognition module which is used for enabling the image to be matched with at least one prestored target image, and transmitting a second instruction to a distance detection module when the matching is successful; the distance detection module which is used for detecting the distance between the distance detection module and the object, and transmitting a third instruction to a movement control module when distances obtained through at least two continuous measurement times; and the movement control module which is used for controlling the detection ball to move in a direction of being far from the object according to the third instruction. The detection ball can automatically avoid the tracking of an enemy, and guarantees the detection safety.