The utility model discloses a fiber bragg grating pull-out type redundancy box. The packaging box comprises a box body and a cover plate, the box body is a cuboid with an upper opening and a lower opening, extension plates are arranged on the upper sides of the four frames, lead holes are formed in the middles of the extension plates of the two long frames, mounting holes are formed in the two sides of the extension plates of the two long frames respectively, one short frame is a drawing edge, and a fixing hole is formed in the middle of the drawing edge. Side plates are arranged on the lowersides of the other three frames except the drawing side, and a drawing opening is formed in the lower side of the drawing side; wherein the cover plate comprises a panel and a clamping plate which arevertically connected, and the side surface of the cover plate is L-shaped; and a screw hole is formed in the middle of the clamping plate. According to the utility model, the sensor is protected by adopting a pull-out box body structure, and one section of the pull-out cover plate is fixed by adopting the buckle, so that the structure is simple and easy to realize, and the sensor is protected while an object in the box body is convenient to disassemble and operate.