Safety early warning isolation fence

The utility model discloses a safety early warning isolation fence, and belongs to the technical field of municipal equipment. A safety early warning isolation fence comprises two stand columns, a first cross rod is fixedly connected between the two stand columns, a second cross rod is movably connected between the two stand columns, a plurality of vertical rods are connected between the first cross rod and the second cross rod, the vertical rods are fixedly connected with the first cross rod, rotating shafts are connected to the inner walls of the vertical rods, and movable gears are connected to the outer walls of the rotating shafts. The outer walls of the two sides of the movable gear are in engaged connection with a first rack plate and a second rack plate correspondingly, the first rack plate and the second rack plate are slidably connected to the two sides of the inner wall of the vertical rod correspondingly, the top of the first rack plate is connected with an anti-holding plate, the anti-holding pla