Large range optical fiber displacement sensor

The invention discloses a large range optical fiber displacement sensor, comprising: a pair of mounting spherical hinges, which comprise a first mounting spherical hinge and a second mounting spherical hinge and the departing ends which are detachably connected to a tested structure; a housing, in which arranged are a horizontal partitioning plate, above which a sliding bolt compartment having an opening end is formed, and a vertical partitioning plate group including a plurality of vertical partitioning plates and a cylinder body forming a vertical center compartment, wherein a closed end of the sliding bolt compartment is in fixed connection with the other end of the second mounting spherical hinge; a sliding bolt comprising a front section and a rear section, wherein the lower end of the rear section is provided with a contact guide groove and wherein one end of the front section remote from the rear section is fixedly connected with the other end of the first mounting spherical hinge; and a conversion dev