The medical diagnostic x-ray bucky stand utilizes the combined effect of the existing medical x-ray machine and the device of the medical institution to perform radiographic examination on the head, chest, abdomen and pelvis of the human body, so as to achieve the purpose of diagnosing the lesion. The x-ray bucky stand can install flat panel detector, cr cassette, x ray film cassette from the size of 14"x17" and 17"x17". It can install the x ray grid.