The invention provides a dummy chest bottoming-out judgment method and a device in the vehicle collision experiment. The method comprises the steps of acquiring the acceleration of a vehicle B-pillar at the collision moment in a vehicle collision experiment; acquiring the acceleration of a dummy arranged at a driver side at the collision moment in the vehicle collision experiment; acquiring the chest compression displacement of the dummy arranged at the driver side at the collision moment in the vehicle collision experiment; calculating the relative movement speed of the dummy relative to a vehicle based on the acceleration of the vehicle B-pillar and the acceleration of the dummy; calculating the chest compression speed of the dummy according to the chest compression displacement of the dummy in the vehicle collision experiment; and judging the bottoming-out condition of the dummy chest according to the relative movement speed and the chest compression speed. According to the invention, based on the dummy chest bottoming-out judgment method and the device in the vehicle collision experiment, whether the dummy chest on the driver side is bottomed out or not in the vehicle collision experiment can be effectively judged. Therefore, the method and the device provide the vehicle safety engineering and technical personnel a basis for the analysis and the judgment of the test.