An ultra-high molecular weight polyethylene road sign comprises a sign board and a supporting plate. The sign board is fixedly arranged at the top end of the supporting plate which comprises a plurality of oblique parallelogram plates, and every two parallelogram plates are spliced. The sign board is a whole ultra-high molecular weight polyethylene board. The parallelogram plates which are obliquely connected are high in stability; the supporting plate is formed by splicing the parallelogram plates so that the height of the supporting plate can be changed as required according to different occasions; indication signals are provided by colors of the parallelogram plates, so that the service life of the road sign is prolonged; and the ultra-high molecular weight polyethylene road sign is fixed to a wall or other fixed supporting objects when used, installation is easy, the requirement for the installing environment is low, and practicability is high.