The invention provides a method for preventing a climber from falling in the process of climbing a tower. The method has the advantages that the structure is simple, operation is convenient, and safety precautions are taken. The method comprises the steps that a row of short foot nails which are evenly arranged in an up-down mode are fixedly welded to the surface of one side of angle steel of the iron tower to be climbed, and a row of long foot nails and short foot nails are fixedly welded to the surface of the other side of the angle steel, wherein the row of long foot nails and short foot nails are evenly and alternately arranged in an up-down mode; the foot nails on the two side faces of the angle steel are arranged alternately; a safety rod is mounted at the top ends of the long foot nails through fixtures; a protection rope is fixedly arranged at the back side of a climbing protection safety belt and provided with two lead-out ends which are respectively provided with a snap ring; a worker ties the safety belt well, buckles the first snap ring to the first section of the safety rod and then starts to step on the foot nails to climb the tower upwards; the worker buckles the second snap ring to the second section of the safety rod when arriving at the second long foot nail, and simultaneously picks off the first snap ring; the worker repeats the steps again and again until the worker arrives at a designated position; the worker can conduct reverse operation to get to the ground after maintenance; the worker unties the safety belt after going back to the ground.