Abstract: The present invention involves a kind of guardrail device used for a highway, wherein, said guardrail plate is formed by PVC resin and has reinforcing bands fixed therein; a bracket is set between a small vertical column and the guardrail plate, the bracket being fixed to the small vertical column, the guardrail plate being fixed to the bracket by frame bolts; a middle large vertical column mechanism is comprised of a middle connecting plate, a connecting ring and a guardrail plates having end portions; two guardrail plates wind reversely within the connecting ring; an end large vertical column mechanism comprises a sheath, an end connecting plate and guardrail plates having end portions, the sheath is fixed to the end large vertical column, the outer sheath is wound around by guardrail plates which are fixed to the end connecting plate by frame bolts. The whole design of the invention is reasonable in structure, have good performance of collision resistance, low cost and long life performance.