The invention relates to the technical field of lamp box devices, in particular to an energy-saving advertising lamp box, which comprises a box body, a lamp tube and foot rests, wherein at least one light reflecting device is mounted at the bottom or the top inside the box body; the light reflecting device is composed of two reflectors; the two reflectors form an included angle, and intersect at the top or the bottom of the box body. Compared with the prior art, the energy-saving advertising lamp box has the benefits that people can see clearly contents on the advertising lamp box for the reason that light emitted by the lamp tube can be effectively reflected onto the box body of the lamp box utilizing the angle formed by the two reflectors by the advertising lamp box; the advertising lamp box is soft in light, environment-friendly and energy-saving; as less lamp tubes are mounted, exposed electric wires are decreased when the lamp tube is in parallel.