An X-ray apparatus capable of releasing a locked rotation of a wheel using a power supplied from an auxiliary battery of an X-ray detector when a body is discharged, and a control method thereof. The X-ray apparatus includes an X-ray detector provided with a detector battery mounted thereto and configured to detect X-rays using power supplied from the detector battery. A body includes a body battery and a detector accommodation unit, in which the X-ray detector is accommodated on the outside. A wheel in the body is rotatable by a power supplied from the body battery and a brake is configured to lock a rotation of the wheel when the body battery is incapable of supplying the power. A controller controls the brake so that a locked rotation of the wheel is released by the power supplied from the detector battery when a rotation of the wheel is locked.
