The invention discloses a vertical hinged door unlatched positioning device. The vertical hinged door unlatched positioning device comprises a base plate of the positioning device, a limiting block, asliding block, a strong magnetic block, a pull spring, a shell, a paramagneticmetal block, a floor and a movable door fan; the vertical hinged door unlatched positioning device is characterized in that an upper clamping head, a hook and a positioning piece are arranged on the base plate of the positioning device; a clamping groove is formed in the upper clamping head, and a through hole is formedin the positioning piece; the limiting block is fixed to the base plate of the positioning device, a sliding groove is formed in the middle of the limiting block, and the limiting block is further provided with a baffle block, a position adjusting screw hole and a lower clamping head; a sliding strip is inserted into the sliding groove from the bottom, thus a screw hole of a limiting pin is exposed, the limiting pin is screwed into the screw hole of the limiting pin, and thus the sliding block is limited in the sliding groove; and the sliding block is provided with the sliding strip, the screw hole of the limiting pin, a convex head and a pull spring hole, a position adjusting pin is screwed into the position adjusting screw hole, the position adjusting pin is adjusted, and the position of the protruded opening of the sliding block can be adjusted. According to the vertical hinged door unlatched positioning device, the door fan can be unlatched well.