Power grid maintenance warning device

The utility model relates to a power grid maintenance warning device which comprises a bottom plate, the top of the bottom plate is fixedly provided with two sleeves, the interiors of the two sleeves are movably connected with supporting columns, one ends of the supporting columns penetrate through and extend to the tops of the sleeves, the tops of the two supporting columns are fixedly connected with a warning board, and the outer sides of the two sleeves are provided with adjusting assemblies. A supporting mechanism is arranged on the outer side of the bottom plate and comprises a fixed bin fixedly mounted on the top of the bottom plate, and a mounting frame is fixedly mounted on the inner top wall of the fixed bin. According to the power grid maintenance warning device, by arranging the supporting mechanism, universal wheels can be driven to move up and down through a moving plate, so that the universal wheels are contracted and can be supported through a bottom plate, instability caused by supporting thro