A vehicle driving assist system is provided that calculates the risk potential of the host vehicle with respect to a preceding object existing in front of a host vehicle. A first driving assistance control system controls at least one of an actuation reaction force exerted by a driver-operated driving operation device and a braking/driving force exerted against the host vehicle based on the calculated risk potential. A second driving assistance control system configured to control the braking/driving force of the host vehicle such that at least one of a host vehicle speed and a headway distance between the host vehicle and the obstacle is maintained. An operating state reporting section reports an operating state of the first driving assistance control system based on an operating state of the second driving assistance control system, the risk potential, and an accelerator pedal actuation state.