Passive acousto-optic voice safety warning device

The utility model discloses a passive acousto-optic voice safety warning device which comprises a warning board, a solar panel, an acousto-optic assembly, a power supply module, an accessory box and a shell, the accessory box is arranged above the shell, and the accessory box is detachably connected with the shell. The acousto-optic assembly is arranged in the accessory box, the power supply module is arranged in the shell, the solar panel is arranged above the shell, and the acousto-optic assembly and the solar panel are electrically connected with the power supply module. Angle iron is arranged on a side panel of the shell, a fixing structure is arranged on the shell, the fixing structure comprises an adjusting rod and a mounting seat, the adjusting rod is rotationally connected with the shell through a bolt and a nut, and the mounting seat is detachably connected with the adjusting rod. The acousto-optic assembly can transmit auditory and visual information to remind people approaching the acousto-optic as