The invention discloses an energy-saving application method for an outdoor advertisement board. The energy-saving application method includes the following steps that 1, a barrel-shaped advertisementboard is installed, wherein an external electromagnet layer is in the powering-off state, a supporting standing column rotates, an external rotating barrel stands still, and after the supporting standing column rotates one circle, the barrel-shaped advertisement board is evenly spread between internal rolling beads and external rolling beads; 2, the external rotating barrel synchronously rotates;3, energy-saving running is carried out, wherein a solar integrated board is arranged at the top of the advertisement board, and when an illumination-intensity sensor detects that the illumination intensity is lower than a set value, the external electromagnet layer is powered off, and a standing column motor rotates at decreased speed or stops running; 4, wind shielding running is carried out. Bymeans of the energy-saving application method for the outdoor advertisement board, the barrel-shaped advertisement board can be rapidly and automatically assembled, and disassembling is convenient; meanwhile, the advertisement board is firmly clamped, and is free of waggling.