A mobile X-ray apparatus for controlling a BMS to shut down through a control unit if the BMS is in an abnormal state, and an operation method thereof. The mobile X-ray apparatus includes a power source unit including a battery and the BMS for managing the battery, and the control unit for detecting the abnormal operation state of the BMS and controlling the BMS to shut down.BMS가 비정상적인 상태인 경우, 제어부를 통해 BMS가 셧다운되도록 제어하는 모바일 엑스선 장치 및 그 동작 방법을 나타낸다.