The invention discloses an outdoor rotary columnar advertising board. The advertising board comprises a base, a supporting stand column, a rotary outer barrel, barrel-shaped billboard transmitting andclamping devices and an advertising board body. The supporting stand column can be driven by a stand column motor to rotate, and the top of the supporting stand column is fixedly connected with the advertising board body; a solar integrated board is arranged at the top of the advertising board body; the periphery of the supporting stand column is sleeved coaxially with the rotating outer barrel,and an opening is formed in one side of the rotary outer barrel; the barrel-shaped billboard transmitting and clamping devices are arranged between the top of the rotary outer barrel and the supporting stand column as well as between the bottom of the rotary outer barrel and the supporting stand column respectively; each barrel-shaped billboard transmitting and clamping device comprises an outer electromagnet layer, outer steel balls, an inner elastic layer and inner steel balls, wherein the outer steel balls are evenly embedded into the outer electromagnet layer, the inner steel balls are evenly embedded into the inner elastic layer, and the radial distance between the inner steel balls and the outer steel balls is larger than the thickness of the barrel-shaped billboard. The barrel-shaped billboard can be rapidly loaded into the outdoor rotary columnar advertising board, and is convenient to detach. Meanwhile, the billboard is clamped stably without shaking.