Guideline length detector for geophysical exploration

The utility model provides a wire length detector for geophysical exploration, which comprises an operating table, a power structure and a measuring structure, mounting tables are fixedly mounted on the front side and the rear side of the upper surface of the operating table, a mounting plate is fixedly mounted on the upper surface of each mounting table, and a first rotating shaft and a second rotating shaft are mounted on each mounting plate. Friction blocks are arranged on the first rotating shaft and the second rotating shaft; the measuring structure comprises a third rotating shaft, a display screen and a counting plate; friction blocks are arranged in grooves of the third rotating shaft and the fourth rotating shaft; the wire is linear in the instrument, so that the wire is enabled to surround the third rotating shaft for just one circle, and the continuous measurement is more accurate. A bulge is arranged on the third rotating shaft; the counting plate does not collide with the third rotating shaft, bu