A mobile X-ray imaging apparatus and method of controlling the same, the mobile X-ray imaging apparatus including a movable main body, an X-ray source installed on the main body via an arm, a tilt angle and rotation angle of the arm being adjustable, a portable X-ray detector configured to detect X-rays emitted from the X-ray source, a position information acquirer configured to acquire position information indicating a position of the X-ray source relative to the portable X-ray detector, and a position controller configured to control the X-ray source to move to a position corresponding to the portable X-ray detector based on the acquired position information.