Disclosed are a backscattered ray shielding mechanism and a portable X-ray generating device comprising the same. The backscattered ray shielding mechanism according to the present invention is mounted on a portable X-ray generating hand-held device to emit X-rays and blocking backscattered X-rays during X-ray emission and includes a lead-free lightweight shielding member, which is detachably or foldably mounted as a convertible form on an X-ray emitting unit of the portable X-ray generating device and partially supported by the X-ray emitting unit.
