The utility model provides an additional lead shoulder rack mounting and fixing device, which relates to the technical field of additional lead shoulder racks and comprises a fixing column, a first threaded hole is arranged on one side of the outer wall of the fixing column, and a shoulder rack body is arranged at the top of the fixing column. According to the utility model, the first screw is screwed into the first threaded hole and the second threaded hole at the same time, so that the shoulder frame body and the fixing column can be preliminarily connected and fixed from the side surface, and then the third screw is screwed into the seventh threaded hole, the third threaded hole and the fifth threaded hole at the same time, so that the fixing frame, the shoulder frame body and the fixing column are connected and fixed from the top; meanwhile, a second screw is screwed into a fourth threaded hole and a sixth threaded hole to connect and fix the fixing frame and the fixing column, the screws are arranged on a plurality of faces, multi-point connection between the additional wire shoulder frame and the installation device can be achieved, and compared with single-point or few-point fixation, the multi-point fixation mode has the advantages that the installation efficiency is improved, and the installation cost is reduced. And the shoulder frame can be effectively prevented from loosening or displacing due to external force.