The utility model provides an automatic clamping rail device of preventing wind of portal crane combines together clamping rail ware and anemoscope, prevent wind according to the size of wind -force is automatic, specifically includes clamping rail ware box, installs clamping rail ware, wind speed monitoring devices, electrical control system and control panel in clamping rail ware box. The automatic clamping rail device of this portal crane becomes digital quantity signal through air speed measuring device with wind speed analog signal transition earlier, is defeated by the PLC command unit with this letter marking again and implements the control and park each actuating mechanism give -out order. Can set for the normal during operation maximum wind speed grade of portal crane by oneself through the computer, when exceeding the set wind speed grade like the wind speed, portal crane traveling system can the auto -power -off and sent the warning simultaneously, and portal crane walking track can be cliied to the automatic clamping rail ware of at this moment installing in the several seconds, ensure equipment, personal security, treats that wind -force falls to the set wind speed grade when following, and the clamping rail ware can automatically terminate, resumes walking control system, can work by restart once more.