The utility model discloses a wooden wardrobe positioning device which comprises a wardrobe body, a positioning cross rod is arranged in the wardrobe body, an extending cross rod is in threaded connection with the interior of the positioning cross rod, the ends, away from each other, of the positioning cross rod and the extending cross rod are fixedly connected with mounting bases, the outer surface of each mounting base is provided with a limiting groove, and the limiting grooves are in threaded connection with the positioning cross rod. The interior of each limiting groove is rotationally connected with a rotating ring, and the outer surface of each rotating ring is movably hinged to a supporting rod. Through cooperation of the wardrobe body, the positioning cross rod and the extending cross rod, the length of the positioning device composed of the positioning cross rod and the extending cross rod is increased, the positioning device is firmly clamped to the needed position in the wardrobe body, and then the positioning device is firmly clamped to the needed position in the wardrobe body through cooperation of the installation base, the limiting groove, the rotating ring, the supporting rod, the extending bottom rod, the supporting bottom plate, the threaded cylinder and the positioning bolt. And the height of the positioning device formed by the positioning cross rod and the extending cross rod is stably adjusted, so that the positioning device for the wooden wardrobe is convenient to use.