The invention provides a limiting supporting rod with a self-locking function, which comprises a main guide rod and an auxiliary guide rod which are matched with each other to slide, a star-shaped rotor is movably connected to the inner side surface of the movable end of the main guide rod, and a main guide rod clamping hole is formed in the side wall of the main guide rod positioned under the star-shaped rotor; a baffle is fixedly arranged on the inner side face of the movable end of the auxiliary guide rod; an auxiliary guide rod clamping hole is formed in the side wall, located on the sameside as the main guide rod clamping hole, of the auxiliary guide rod. Locking or unlocking between the main guide rod and the auxiliary guide rod is achieved through cooperation of the baffle, the star-shaped rotor, the main guide rod clamping hole and the auxiliary guide rod clamping hole. The auxiliary guide rod slides along the main guide rod, a locking point is formed by applying force to thestar-shaped rotor, and the self-return type locking and limiting function on the door is achieved.