Building lighting energy-saving system

The utility model relates to a building lighting energy-saving system and relates to the technical field of building lamps, the building lighting energy-saving system comprises a mounting base, a ceiling lamp and a driving assembly, the mounting base is fixedly connected with a ceiling, the ceiling lamp comprises a lamp holder and a bulb, a containing groove is formed in the bottom of the mounting base, the lamp holder is located in the containing groove, and the bulb and the lamp holder are detachably connected; the driving assembly comprises a reel, a pull wire and a driving part, the reel is rotationally connected with the mounting base, the pull wire is wound around the reel and used for driving the lamp holder to ascend and descend, and the driving part is used for driving the reel to rotate. When the bulb is replaced, the driving assembly can drive the lamp holder to ascend and descend, when the lamp holder descends to a proper height, an operator can stand on the ground to detach the bulb from the lamp