The invention discloses an automobile and a tire pressure monitoring method thereof. The automobile comprises a plurality of wheels and a plurality of motors, and the motors correspondingly drive thewheels. The method comprises the following steps: when the state of the automobile meets a preset state, separately acquiring rotating speeds of the motors; and judging whether the tire pressures of the wheels are normal or not according to the rotating speeds of the motors. Therefore, a tire pressure sensor is not required, hardware cost for the tire pressure sensor is saved, and later change orrepair costs are also saved.