Device capable of shortening laser transmission distance

The utility model discloses a device capable of shortening a laser transmission distance, which comprises two concave-convex lens brackets, the number of the concave-convex lens brackets is two, the concave-convex lens brackets are symmetrically arranged, sleeve plates are arranged on the front surfaces and the back surfaces of the concave-convex lens brackets, two sides of the concave-convex lens brackets are fixedly connected with limiting rods positioned in the sleeve plates, and the limiting rods are fixedly connected with the concave-convex lens brackets. A support is fixedly connected to the top of the sleeve plate, a connecting plate is fixedly connected to the top of the support, a vertical plate is fixedly connected to the top of the concave-convex lens frame, a threaded rod is movably connected to the interior of the connecting plate through a bearing, a threaded sleeve is in threaded connection to the surface of the threaded rod, and a crank is movably connected to the surface of the threaded sleev