The present invention relates to a portable device for displaying an X-ray photographing area. The objective of the present invention is to display, in real time, an X-ray irradiation portion in a liquid crystal display unit attached to a portable X-ray photographing device by calculating the image and the photographed range acquired through a CCD camera, the X-ray irradiation distance to a subject, the set voltage and current, and the radiation exposure amount of a patient according to the irradiation time so that the irradiation range can be accurately identified and photographed. To achieve the objective, the portable device for displaying an X-ray photographing area displays, in a screen, the irradiation area of an X-ray irradiated through an X-ray oscillation unit including an X-ray tube for emitting the X-ray, a high voltage generation unit for applying a high voltage to the X-ray tube, and an X-ray control unit for controlling the high voltage generation unit. The portable device for displaying an X-ray photographing area comprises a subject image acquisition unit for acquiring a surface image of an X-ray irradiation range photographed by the X-ray oscillation unit； a liquid crystal display unit for displaying, in real time, a subject image acquired through the subject image acquisition unit, an X-ray photographing range, a distance to a subject, the X-ray absorption amount, and the photographed X-ray image； a distance measurement unit for measuring the distance from the X-ray tube to the X-ray irradiation location； and a main control unit for outputting the image displaying the X-ray irradiation limit range in the image acquired by a CCD camera module through the liquid crystal display unit and calculating the X-ray skin absorption amount of an examinee according to X-ray irradiation conditions to be displayed in the liquid crystal display unit. [Reference numerals] (101) Infrared ray distance sensor； (111) ADC unit； (112) CCD camera module； (113) Main contr
