A ray energy calibration device, comprising: a plurality of calibration members each comprising a calibration block and configured to enter a ray region , through which rays pass, so as to calibrate energies of the rays; and a plurality of wheels arranged to be synchronously rotatable about a common shaft and each provided with one or more protruding blocks at respective specific position of an outer circumference thereof, wherein at least one of the wheels is provided with a plurality of protruding blocks on outer circumferences thereof, the plurality of wheels being arranged such that a corresponding one of the calibration members is driven by the plurality of protruding blocks of the at least one of the wheels for more than one times during one circle of rotation of the wheels; wherein, each of the calibration members is arranged to correspond to one of the plurality of wheels, such that the protruding blocks at respective specific position of the outer circumference of each of the plurality of wheels is movable, through rotation of a corresponding one of the plurality of wheels, from a position where the protruding blocks are not in contact with the calibration members to a position where the protruding blocks are in contact with the calibration members, so as to respectively drive the calibration members to move from initial positions to calibration positions in a radial direction of the wheel and away from the outer circumference of the wheel; and wherein each of the plurality of wheels is rotatable such that the one or more protruding blocks thereon moves away from the position where the protruding blocks are in contact with the calibration members to disengage with the calibration members, so that the calibration members return to the initial positions from the calibration positions. a plurality of calibration members each comprising a calibration block and configured to enter a ray region , through which rays pass, so as to calibrate energies of the rays; and a plurality of wheels arranged to be synchronously rotatable about a common shaft and each provided with one or more protruding blocks at respective specific position of an outer circumference thereof, wherein at least one of the wheels is provided with a plurality of protruding blocks on outer circumferences thereof, the plurality of wheels being arranged such that a corresponding one of the calibration members is driven by the plurality of protruding blocks of the at least one of the wheels for more than one times during one circle of rotation of the wheels; wherein, each of the calibration members is arranged to correspond to one of the plurality of wheels, such that the protruding blocks at respective specific position of the outer circumference of each of the plurality of wheels is movable, through rotation of a corresponding one of the plurality of wheels, from a position where the protruding blocks are not in contact with the calibration members to a position where the protruding blocks are in contact with the calibration members, so as to respectively drive the calibration members to move from initial positions to calibration positions in a radial direction of the wheel and away from the outer circumference of the wheel; and wherein each of the plurality of wheels is rotatable such that the one or more protruding blocks thereon moves away from the position where the protruding blocks are in contact with the calibration members to disengage with the calibration members, so that the calibration members return to the initial positions from the calibration positions. <EOS>