A mobile X-ray imaging apparatus includes an X-ray tube configured to emit X-rays, an extendable arm configured to support the X-ray tube, a support post configured to move the extendable arm in a direction perpendicular to the ground, a carriage portion configured to control the X-ray tube to emit the X-rays and to support the support post, and including a movable unit, a monitor disposed on an upper surface of the carriage portion, and an arm opening and closing unit configured to open and close the extendable arm with respect to the support post.
