A vehicle driving assist system is configured to provide a driver with advanced notification regarding changes in the operating states of the controls when several controls are being executed. The vehicle driving assist system has a controller configured to execute an accelerator pedal actuation reaction force control based on a risk potential that indicates a degree of convergence between the host vehicle and a preceding obstacle and an automatic braking control based on the possibility of contact between the host vehicle and the preceding obstacle. When the automatic braking control will change from a low operating state to a high operating state while an actuation reaction force is being generated in the accelerator pedal in accordance with the risk potential, a pulsed supplemental reaction force is generated in the accelerator pedal and an alarm sound is generated.