The invention relates to a road retained method for extrusion molding of waste rock, belonging to the technical field of mine exploitation and comprising the following steps of: (1) fixing a template beside the road to be retained, wherein the template is placed vertically and parallel to the road, faces to a goaf, and a certain distance is maintained between the template and the goaf to form an area to be filled; (2) smashing the waste rock into granules, adding cementitous materials to stir uniformly to form filler; (3) filling the filler in the area to be filled to form an infill; and (4) removing the template and moving the template along the work surface, and then entering the next filling circle. The invention realizes a retained road by using the waste rock as raw materials, changes waste material into things of value, and reduces discharging pollutants of waste rock; a rock bolt is added beside the road so that the stability of the retained road is increased; comprehensive mechanic operation is adopted, thereby the labor intensity is reduced and the efficiency is improved; opened operation is adopted, therefore, the problems of pipe blocking and the like are avoided and better reliability are achieved; the extraction and support for the retained road are free from cross interference and in great safe condition; and the obtained infill has great width, reasonable structure, low air leakage ratio and great reliability.