The invention discloses a system preventing and controlling driver disabled glare and detecting faults. The system is composed of a measuring mechanism, a control mechanism and an executing mechanism, wherein the control mechanism is a processor, the measuring mechanism is composed of a light intensity sensor set and a small laser distance-measuring sensor, and the executing mechanism comprises a glare shielding mechanism, a headlamp switching device and an alarming device. When a headlamp dazzles the eyes, the glare shielding mechanism is started to perform shielding, the headlamp switching device works, and a high beam is switched to a low beam; when the disappearing phenomenon occurs, a red lamp in the alarming device gives an alarm, and the headlamp switching device works; when the phenomenon that the headlamp dazzles the eyes or the disappearing phenomenon occurs, the small laser distance-measuring laser sensor transmits the distance information to the processor, the processor judges that a barrier exists in front, and a buzzer gives an alarm. The system preventing and controlling the driver disabled glare and detecting the faults solves the problems that most of systems in the prior art are operated manually and poor in practicability and traffic accidents caused by the disabled glare happen frequently, and improves driving comfort of a driver and safety of road traffic.