The invention discloses a light-control circuit board with material saving and a low cost, a pedestal disk with a simple structure matched with the light-control circuit board, and an LED display module which enables the assembly between the light-control circuit board and the pedestal disk to be more efficient, the flexing resistance to be high, the circuit performance to be stable and the assembly efficiency to be high. The light-control circuit board is formed by splicing a plurality of finished circuit board bodies in the shape of a strip or a block, and any one of the finished circuit board bodies in the light-control circuit board can be electrically connected and assembled with a plurality of other related finished circuit board bodies by in-plane cross-over, vertical stacking and overlaying of connecting welding spots. The finished circuit board bodies are functional module rigid boards, functional module flexible boards and telecommunication transmission flexible boards separately. The LED display module realizes the advantages of high voltage power supply and long distance power supply and combination of a large-volume display screen, and realizes the application such asquick installation, repeated disassembly and assembly and re-utilization by hanging on an exterior wall of a high-rise building, the exterior of a building under construction, a tower truss of a large-scale performance site and by sticking to the exterior of the building with a smooth surface such as a glass curtain wall.