The rebar size is manually input into the numerical control processing equipment of the rebar by steel bar processing workers, which might lead to the error information input and seriously lowered processing efficiency of rebar. In response to it, a method of extracting steel processing data from the IFC file and digitally transmitting it to CNC rebar machining equipment was proposed in this paper, through which, rebar entity formation is parsed and extracted from the IFC file and then encoded in BVBS format. On this basis, the coded data converted into PDF417 barcode format is submitted to rebar processing workers. Rebar processing workers in the processing factory input rebar processing information into MEP rebar CNC machining equipment via scanning QR codes. This proposed method has been applied in the Hefei-Zongyang Section of the Dezhou-Shangrao National Expressway. The technology in the paper is proven to be effective in cutting the intermediate links such as workers' diagram reading and input and improving the processing efficiency and accuracy of rebar through converting the steel bar model in IFC format into CNC machining files.