The invention provides an optical fiber sensing device used for edge baffles. The optical fiber sensing device can effectively solve the problem that the optical fiber sensing contact is easy to block by surrounding galvanizing zinc during working, and specifically comprises an optical fiber sensing head cover, an optical fiber sensor support frame, an optical fiber sensing contact I and an optical fiber sensing contact II, wherein the optical fiber sensor support frame is arranged at the lower part of the optical fiber sensing head cover and fixedly connected with the optical fiber sensing head cover; a U-shaped groove is formed in the optical fiber sensing head cover; the optical fiber sensing contact I and the optical fiber sensing contact II are arranged on the side wall of the U-shaped groove; a blowing duct matched with the U-shaped groove is further arranged in the U-shaped groove. According to the optical fiber sensing device used for edge baffles, the blowing duct is arranged in the optical fiber sensing head cover, so that air is always blown out from the transmitter channels of the optical fiber sensing contacts in the optical fiber sensing head cover, positive pressure is generated at the parts close to the optical fiber sensing contacts, and galvanizing zinc is effectively prevented from entering the transmitter channels to block the optical fiber sensing contacts.