The invention relates to the field of lighting lamp boxes, in particular to an energy-saving lamp box. The energy-saving lamp box comprises a box body, a panel, a power supply module, a dispersed EL device and a transparent fluorescent plate with the surface coated with photoinduced energy storage fluorescent powder, the fluorescent plate is parallel to the panel and is fixedly installed in the box body, the dispersed EL device is installed on the side, facing the bottom face of the box body, of the fluorescent plate, and the dispersed EL device is connected with the power supply module. The energy-saving lamp box disclosed by the invention is applied; the power supply module can work for a period of time to provide electric energy; the dispersed EL device generates cold light in the period of time to provide illumination for the lamp box; meanwhile, after the fluorescent powder on the fluorescent plate is irradiated by cold light, light energy is stored, the power supply module stopsworking, the dispersed EL device stops emitting light, the fluorescent powder releases fluorescent light to provide illumination for the lamp box, the fluorescent illumination duration time is long, and therefore the power supply module is prevented from continuously working, and the energy-saving purpose is achieved.