PURPOSE: A device for detecting defects of a pressure container is provided to photograph variations on a surface of a pressure container caused by a heating body in the inside of the pressure container as thermal images and displays the same, thereby precisely inspecting the pressure container after cooling a surface of a pressure container in order to have a uniform temperature distribution. CONSTITUTION: A device for detecting defects of a pressure container comprises a pressure container(100), a cooling unit, a photographing unit(300), a display unit(400), and a controlling unit(500). A heating body having thermal energy is embedded or moved in the inside of an accommodation unit of the pressure container. The pressure container is heated by the thermal energy of the heating body. The cooling unit jets a cooling gas on a surface of the pressure container, thereby cooling the surface of the pressure container. The photographing unit photographs variations on the surface temperature of the pressure container as thermal images. The displaying unit the thermal images photographed by the photographing unit. The controlling unit controls the operation of the cooling unit and photographing unit.
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