Navigation mark anti-collision protection structure

The utility model discloses a navigation mark anti-collision protection structure which comprises a base, the top of the base is fixedly connected with a navigation mark body, one side of the navigation mark body is fixedly connected with a plurality of sliding rails, the sliding rails are symmetrically arranged, the inner sides of the sliding rails are in threaded connection with screws through screw holes, and the screws are rotated anticlockwise and taken down. The sliding blocks slide to the height needing protection on the inner sides of the sliding rails, then the sliding blocks are fixed in the mode that the screw rods and the sliding blocks are connected on the inner sides of the screw holes, when impact is caused by external force, the sliding blocks firstly make contact with the contact pads on one sides of the buffer plates, then the contact pads slide on the inner sides of the sliding blocks and extrude the buffer blocks, and the buffer blocks absorb impact force through the springs; when an exter