The invention relates to an erecting method for a cableway used for transporting in electric transmission line construction, in particular to an erecting method for a multiple-supporting-point fixing type heavy load cableway with a corner in a mountain area. The erecting method for the multiple-supporting-point fixing type heavy load cableway with the corner in the mountain area is based on the structure and the technical characteristic of the multiple-supporting-point fixing type heavy load cableway with the corner and a full hydraulic cableway traction machine and comprises the processes of foundation pit dividing, ground anchor burying, support assembling, lay-out and tensioning of working cable, cableway operating and maintaining and the like. Mounting processes of straight-line bearing cable, corner anchoring and closed-loop arrangement of a traction rope with a corner, the difficult problem of multiple-supporting-point fixing type heavy load cableway with the corner in the mountain area is solved effectively. An efficient and safe construction method is provided for the application and popularization of the multiple-supporting-point fixing type heavy load cableway with the corner, and the safety of cableway erecting personnel is guaranteed powerfully, and application prospects are wide.