The utility model provides a road structural layer construction steel formwork support system that paves to effectively improve road structural layer marginal portion's construction quality, avoided the secondary treatment at later stage structural layer edge, thereby shortened the time of construction. Including setting up the template outside road structural layer horizontal both sides to and set up beyond the template and to its A -frame who forms the fixed stay, each A -frame is fixed in on the basis below the road structural layer by front end drill rod, rear end drill rod along road structural layer extending direction interval.