The invention provides a double X-ray machine system and a control method thereof. Under control of a controller, a synchronous segmented elevating mechanism is used to drive a first X ray source, a first X ray surface receiver, a second X ray source, and a second X ray surface receiver to synchronously move to a plurality of segments of different heights, and the first X ray source and the second X ray source disposed in the corresponding segments are used to emit X rays, and then the whole plate surface of the receiving plate of the first X ray surface receiver and the whole plate surface of the receiving plate of the second X ray surface receiver are used to acquire plane images, and therefore pre-detection part plane images corresponding to all of segments of the first X ray source and the second X ray source are acquired. The dosage parameters of the various segments during front position shooting, side position shooting, and inclined position shooting are preset in the controller, and the first X ray source and the second C ray source are used to emit the X rays according to the preset dosage parameters at the corresponding shooting angles and the corresponding segments. The dosage parameters are set according to different parts of a body, and radiation is greatly reduced, and therefore human body standing position whole body pictures at two orientations are acquired, and therefore medical analysis and planning is facilitated, and scanning speed is fast.