Disclosed is a train load measuring system and a method thereof. The train load measuring system includes a speed/acceleration measuring unit, a position measuring unit, a railway-line state receiving unit, a driving/braking force receiving unit and a calculate unit. The speed/acceleration measuring unit measures a speed and acceleration of the train. The position measuring unit measures a current position of the train. The railway-line state receiving unit receives a railway-line state. The driving/braking force receiving unit receives driving and braking forces of the train. The calculating unit calculates a train load based on information transferred from the units.