A motor driving device for a vehicle includes a brushless DC (BLDC) motor driving device for optimizing electromagnetic compatibility (EMC). The motor driving device includes: a motor controller that controls driving of a motor in response to an operation of a switching element; and a drive semiconductor that controls a drive current of the motor controller in response to a predetermined register value, and controls electromagnetic compatibility (EMC) tuning by adjusting a switching time of the switching element in response to a drive current that is charged or discharged in or from the motor controller.