The invention relates to an LED lamp band fixing device. The LED lamp band fixing device comprises connecting pipes, sleeves and conveyor belts. The sleeves are connected with the connecting pipes and can rotate relative to the connecting pipes. The conveyor belts are arranged on the sleeves in a sleeving mode. LED lamp bands are fixed to the conveyor belts through fasteners. By adopting the LED lamp band fixing device, when ultrahigh modeling interior light-transmitting lamp bands are mounted, a large amount of manpower can be saved, and the mounting cost can be lowered; and meanwhile, climbing mounting is not needed, potential safety hazards during working aloft can be reduced, the mounting difficulty is lowered, and the construction speed is increased.