The invention provides a vehicle safety monitoring method and system. The method comprises steps as follows: the rotating speed and the angular velocity of a wheel are detected; the tire pressure state of a tire is judged according to the rotating speed and the angular velocity of the wheel; when the tire pressure state is a low-pressure state, an alarm is given. The tire pressure state of the tire is judged according to the rotating speed and the angular velocity of the wheel, a pressure sensor is not required to be directly mounted in the tire to sense the tire pressure of the tire, the tirepressure state of the tire is obtained under the condition that original design or state of the tire is not damaged, the alarm is given when the tire pressure of the tire is too low to timely reminda user, and the risk of safety accidents is reduced.