A receiver and a common-mode voltage calibration method thereof are provided. The receiver includes sensing circuits, a phase comparator, and a self-calibration circuit. The phase comparator compares phase relationships of the latch results at the output terminals of the sensing circuits during a testing period to produce a phase comparison result. During the testing period, the self-calibration circuit provides the same differential signal to the input terminals of these sensing circuits, and sets common-mode levels at the input terminals of these sensing circuits to be different from one another. The self-calibration circuit determines a calibrated common-mode level based on the phase comparison result. The self-calibration circuit sets the common-mode levels at the input terminals of these sensing circuits to be equal to the calibrated common-mode level during a normal operation period.