The invention discloses an outdoor electronic information board spraying device. The outdoor electronic information board spraying device comprises an electronic information board body. A metal outerframe is arranged on the periphery of the electronic information board body and comprises an upper frame and a lower frame. Guide rails are arranged on the front face of the upper frame and the frontface of the lower frame correspondingly. The guide rails are matched with motion sliding blocks. The two sliding blocks are connected with a machine frame. The upper frame and the lower frame are provided with racks correspondingly. The machine frame is provided with a shaft rod, the shaft rod is connected with the machine frame through bearing blocks, and gears are arranged at the two ends of theshaft rod correspondingly and are in meshing connection with the racks. One end of the shaft rod is provided with a motor driving the shaft rod to move. A spraying water pipe is fixed to the machineframe and provided with a plurality of spraying heads at intervals. One end of the spraying water pipe is connected with a water supply pipe which is a plastic hose. The device is high in automation degree, convenient to use and capable of effectively achieving the purpose of automatic cleaning of the surface of an electronic advertisement board, manual climbing is not needed, and the cleaning safety is greatly improved.