Stepping positioning system for calibration mechanism

The invention discloses a stepping positioning system for a calibration mechanism. The stepping positioning system comprises a motor controller, a stepping mechanism and an in-place detection device. The stepping mechanism comprises a stepping motor which is used for driving the calibration mechanism to move; the in-place detection device comprises a first in-place detector, a second in-place detector and an in-place judger, wherein the first in-place detector is used for judging whether the calibration mechanism reaches a first calibration position or not and outputting an indication signal to the in-place judger, the second in-place detector is used for judging whether the calibration mechanism reaches a second calibration position or not and outputting an indication signal to the in-place judger, and according to the indication signals outputted by the first in-place detector and the second in-place detector, the in-place judger generates an in-place indication signal which is outputted to the motor controller; and the motor controller controls the movement or stoppage of the stepping motor of the stepping mechanism according to the received in-place indication signal. The stepping positioning system for the calibration mechanism has the advantages that: the calibration mechanism can be reliably and accurately positioned under the drive of the stepping motor.