Barrier alarm system and operation method thereof

The invention discloses a barrier alarm system and an operation method thereof. By adopting the barrier alarm system and the operation method thereof, a barrier detection unit and a sight detection unit are adopted to observe pupils of a driver so as to implement view angle estimation, then moving articles or fixed targets within about tens of miles around a vehicle can be detected, and whether the barriers can actually affect driving safety or not can be judged according to moving directions and speeds of the barriers; furthermore an alarm message can be transmitted in case the driver does not notice the risk, thereby ensuring that the driver can notice the risk and make response.