The present invention provides an X-ray imaging system for capturing an X-ray image of teeth and a jawbone, including a tubular X-ray generating unit placed in an oral cavity, and a movable X-ray detection unit placed in the oral cavity outer side region corresponding to the X-ray generating unit and corresponding to a face or an X-ray detection unit having a curved surface shape similar to the face.The present invention having the configuration may obtain a teeth X-ray image with a large surface area while minimizing the dose of X-ray exposed to a patient by placing an X-ray generating device in the oral cavity and disposing a movable sensor or a sensor with a large surface area on the outer side of the oral cavity to obtain an X-ray image, reduce excessive X-ray exposure and foreign body sensation in the oral cavity, which a panoramic mode X-ray generating device or an oral sensor-type X-ray generating device in the related art has, to enhance the safety and convenience of the patient, and obtain a clear image with a large surface area, which helps a medical staff in making an exact judgment, with the least number of shootings.