The utility model discloses a bridge floor beam wind protection monitoring early warning system, including and arranging at the windbreak of bridge floor both sides and arrange with the fixed spacing that every ultrasonic wave wind speed monitor all is connected with a data acquisition instrument at the inboard ultrasonic wave wind speed monitor of bridge floor windbreak that data acquisition instrument is connected with information processing module through a transmission network along the bridge total length, information processing module passes through the 2nd transmission network and is connected with the information issuing module, through prison wind velocity measurement and indicate and remind the driver carrying out information issuing, solved the problem that exists among the prior art, can avoid sealing the forbidden problem of bridge once the strong wind needs appearing, but the traffic accident that causes of greatly reduced bridge floor crosswind moreover improves conveying efficiency.