Metro line center relative distance measuring device

The utility model discloses a subway line center relative distance measuring device which comprises an upper box body and a lower box body, handles are fixedly arranged on the upper box body and the lower box body, mounting racks are fixedly arranged on the upper box body and the lower box body, the mounting racks are connected through bolts, through holes are formed in the bolts, second grooves, movable plates and pull rods are arranged in the mounting racks, and the movable plates and the pull rods are arranged in the second grooves. A through hole is formed in the upper box body, a pull rod is arranged in the through hole, a second spring sleeves the pull rod, a clamping mechanism is arranged between an inner cavity of the upper box body and an inner cavity of the lower box body, a range finder is placed on the clamping mechanism, handles are arranged on the upper box body and the lower box body, and when a user picks up the box body, the two handles are held, so that the phenomenon that the upper box body