Disclosed herein is an apparatus for manufacturing a polycrystalline silicon ingot for solar batteries having a door control device using a hinge. The apparatus includes a vacuum chamber, a crucible, a susceptor which surrounds the crucible, a heater which heats the crucible, and an insulation plate which is disposed below the susceptor and has an opening therein. The apparatus further includes a cooling plate which moves upwards through the opening of the insulation plate and comes into close contact with or approaches the lower end of the susceptor, a cooling plate moving unit which actuates the cooling plate, a temperature sensor which measures the temperature of the crucible, and a control unit which controls the temperature in the crucible and the cooling plate moving unit. Furthermore, a door is provided on the insulation plate to open or close the opening of the insulation plate. The hinge is provided between the door and the insulation plate. Thus, after the raw silicon material is melted, when the cooling plate moves upwards to cool the crucible and thus pushes the lower surface of the door upwards, the door is opened by the hinge in a swinging manner, and when the cooling plate approaches or comes into contact with the lower end of the susceptor, one end of the opened door is leaned on a corresponding surface of the cooling plate.