A warning sign placing apparatus and a control method thereof are provided. The warning sign placing apparatus includes at least two camera units, a control unit, and a vehicle. The camera unit captures a plurality of images in a preset direction. The vehicle carries at least two camera units and control unit. The control unit identifies a traveling direction of the road and distinguishes at least one object on the road based on the images, and plans a route along the road for the vehicle according to the at least one object, where the vehicle travels along the route. A warning sign is configured in the warning sign placing apparatus and is able to automatically move to a preset position with a preset distance in order to avoid the risk of dangers in a case of manually placing the warning sign.