The invention provides a vehicle collision responding method applied to an electric or hybrid power vehicle. The method includes the steps that a potential collision target reported by vehicle-mounted radar and/or a vehicle-mounted camera and collision prejudgment information related to the potential collision target are obtained; based on the collision prejudgment information, whether the vehicle is about to collide with the potential collision target or not is prejudged; and if it is prejudged that the vehicle is about to collide with the potential collision target, the output current of a vehicle-mount power supply is reduced to a set safety value within preset time, wherein the preset time is shorter than collision remaining time. By the adoption of the method, the output current of the vehicle-mount power supply can be reduced to the set safety value in advance when it is prejudged that the vehicle is about to collide, and the traveling safety is improved.