The present invention discloses an optical fiber intelligent bolt with a loosening monitoring ability. The bolt comprises a bolt body, a nut is arranged at the top of the bolt body, a first installation hole arranged along a vertical direction is coaxially arranged at the top of the bolt body, the first installation hole penetrates the nut from up to down, a horizontally arranged through hole is arranged at the tail of the bolt body, the through hole penetrates the bolt body from left to right, a latch is embedded in the through hole, an elastic bending rod is integrally arranged at the tail end of the latch, a counterweight ball is fixed at the tail end of the elastic bending rod, a second installation hole is arranged in the latch, a third installation hole is installed in the elastic bending rod, and the third installation hole penetrates the counterweight ball; and a first optical fiber sensor is packaged in the first installation hole, a second optical fiber sensor is packaged in the second installation hole, and a third optical fiber sensor is packaged in the third installation hole. The optical fiber intelligent bolt with a loosening monitoring ability is realized.