The invention relates to a tension release construction method for an inhaul cable. An operation platform is arranged on a beam surface, a temporary sling is installed, and a protective jacket is stripped. Then, tensioning equipment is used for tensioning and cutting off one or more steel wires, and tension release is conducted on the inhaul cable gradually. In addition, a rear tip protecting device is installed on a cable body. Finally, the cut-off inhaul cable is dismounted, and tension release and dismounting operation are completed. By means of the method for tension release of one or more steel wires, cable replacement construction of the inhaul cable which cannot be subjected to tension release through anchorage devices at the two ends is achieved; and in addition, by arranging the corresponding tension release construction protecting device, the requirement for safety in the tension release process is met.