Quick fixing clamp for high-speed maintenance warning sign

The utility model belongs to the technical field of expressways, and particularly relates to a quick fixing clamp for a high-speed maintenance warning sign, which comprises a base, universal self-locking wheels are fixedly connected to four corners of the bottom of the base respectively, a support frame is fixedly connected to the top of the base, a first sliding groove is formed in the surface of the support frame, and a second sliding groove is formed in the surface of the support frame. A connecting base is slidably connected into the first sliding groove. According to the warning board fixing device, a warning board is placed in a corresponding inserting groove according to the thickness, a limiting frame is loosened, a two-way lead screw is rotated to enable a clamping arm to move and clamp the warning board, a second threaded rotating rod is rotated to drive a sliding block to slide, the limiting frame abuts against the top end of the warning board, then the warning boards of various sizes are fixed, an