The invention relates to the robot engineering, in particular to a small child-mother robot folding gangway applied to the field of the fire control. The small child-mother robot folding gangway is arranged on a mother robot and comprises a box body, a front gangway section and a rear gangway section. The box body serving as the main support of the mother robot is provided with a driving device. One end of the front gangway section is hinged on the box body. A hinge shaft is connected with the driving device. The other end of the front gangway section is hinged with the rear gangway section. The front gangway section drives the rear gangway section to be unfolded or folded by the driving of the driving device. The invention has simple structure and low cost, and is convenient for protection of the fire field operation. When the robot turns over and goes up and down the stairs, the gangway is subjected to the external impact force from the robot, and due to the self-locking of a worm gear device, the driving shaft of the gangway can be locked automatically and has good reliability. The gangway is fixed by pull-in of the iron sheet and the magnet and the magnetic force so that when the robot moves, turns over, goes up and down the stairs and is shocked, the tail end of the gangway can be prevented from swinging freely.