The invention discloses a clamp used for fixing a vibration optical fiber, and relates to the railway communication technology field. The clamp is formed by a profiled fixing plate and a U-shaped hoop. On one hand, the fixing clamp is used to guarantee fixed arrangement of an optical fiber connected with a barbed wire cage, and on the other hand, requirements of road conditions along normal speed or high speed railways are satisfied. The clamp has advantages of simple and practical device, low price, and applicability in batch use along railways.