The invention discloses an adjustable X-ray radiography machine special for medical treatment. The adjustable X-ray radiography machine comprises a mounting rack, a work table, a first adjusting device, an X-ray radiography device and a human body support device, wherein the first adjusting device comprises a lead screw, a drive mechanism, a movable part, a mounting plate and an air cylinder; thelead screw is horizontally mounted on the top of the mounting rack; the mounting rack is provided with the drive mechanism used for driving the lead screw to rotate; the movable part is in threaded connection to the lead screw; the mounting plate is mounted on the bottom of the movable part, and the mounting plate is provided with the air cylinder used for controlling the X-ray radiography deviceto move along the vertical direction; the X-ray radiography device is mounted above the human body support device; and the human body support device is arranged on the work table. For the adjustable X-ray radiography machine special for medical treatment, due to the arrangement of the first adjusting device, the adjustment on the horizontal position, vertical position and radiography angle of theX-ray radiography device is realized, a support post arranged on the human body support device is in sliding connection with a sliding chute, so that the forward-backward movement of the human body support device is realized, the adjusting function is diversified, and thus the X-ray radiography operation is more accurate.