The utility model provides a special guard rail of hump car retarder, including support rail seat, guardrail and clamp plate, the support rail seat be " L " shape, the tip fixed mounting guardrail of its vertical one side, and the middle part of its level one side is equipped with the mounting groove, tip and clamp plate fixed connection, the flange of rail of mounting groove and clamp plate cooperation chucking stock rail, still be equipped with adjusting shim between support rail seat and the guardrail, the contact segment of support rail seat, clamp plate and stock rail is equipped with the anti -creep pad, include still that the anti -creep presss from both sides, anti -creep mounting board dress is at the flange of rail of stock rail. Special guard rail of hump car retarder, simple structure, the installation maintain conveniently and the commonality good, can install on gravity type and non - gravity type car retarder. The wheel of can effectual swift current to the reduction gear putting the vehicle plays the protective action, reduces the reduction gear and falls the accident rate. The utility model discloses with stock rail direct contact not, can guarantee its insulating properties.