High-precision distance measuring device and distance measuring method thereof

The invention discloses a high-precision distance measurement device and a distance measurement method thereof, and belongs to the technical field of high-precision distance measurement, the high-precision distance measurement device comprises a protective cover, an optical fiber time service sensor is detachably mounted in the protective cover, openings are formed in the bottom and one side edge of the protective cover and penetrate through an inner cavity, and inner reference surfaces are fixedly mounted at the openings in an embedded manner; one side of the protective cover is vertically and fixedly provided with two fixing plates which are consistent in specification and are arranged in parallel, and one ends, far away from the protective cover, of the two fixing plates are jointly, vertically and fixedly provided with an outer reference surface, so that the problem that the distance measuring precision is influenced by different speeds when signals of the optical fiber time service signal distance measur