The invention provides a novel manufacturing and installing method for a cable holder. Holes are formed in the cable holder according to a certain technological standard, cable grooves, hoops, reinforcing ribs, fireproof division plates and the like can be arranged on supporting arms of the holder as needed, reserved holes are formed in the two walls of a cable trench, and then the cable holder and the walls can be assembled and disassembled fast through expansion bolts. Through material selection, premachining, accessory addition and preliminary combination of the cable holder, the installation procedure can be achieved at one step, so that the labor and the time are saved, the cost is saved, the problem that installation, maintenance, fixation, rust prevention, fire prevention and the like of an existing cable holder are difficult is solved, and the whole cable holder is stable, scientific in design, convenient to manufacture and install, safe and practical. Thus, the novel manufacturing and installing method is worthy of popularization and application.