The utility model relates to a bridge engineering technical field especially involves an arched bridge cable hoist and mount construction method is with long adjusting device of cable. The setting be used for adjusting on knotted rope 1 with the elongation that reads knotted rope 1, press from both sides cable anchor section of thick bamboos 2 including two, press from both sides that a cable anchor section of thick bamboo 2 is fixed to be set up on knotted rope 1, two press from both sides a cable anchor section of thick bamboo 2 and set up along the length direction interval of knotted rope 1, the cable anchor section of thick bamboo 2 that presss from both sides go up the articulated first regulation parts that have, first regulation part with two to press from both sides cable anchor section of thick bamboos 2 articulated respectively, through adjusting first adjust the part make two press from both sides cable anchor section of thick bamboos between 2 the distance increase or reduce to adjust the elongation of knotted rope 1. This device adds the condition that reads the long elongation of cable through the fine setting under, the elevation of case, convenient and practical are encircleed in quantitative adjustment.