Field warning device

The utility model discloses a site warning device which comprises a warning board, a supporting frame and two connecting blocks, the two connecting blocks are located on the left side and the right side of the bottom of the warning board respectively, the left side and the right side of the top of the supporting frame make contact with inner cavities of the connecting blocks, and placing grooves are formed in the left side and the right side of the top of the supporting frame. A positioning mechanism used in cooperation with the warning board is arranged in an inner cavity of the containing groove, and a transmission mechanism used in cooperation with the positioning mechanism is arranged in the inner cavity of the containing groove. Through cooperative use of the warning board, the supporting frame, the connecting block, the containing groove, the positioning mechanism and the transmission mechanism, the problems that in the process of assembling an existing warning board and the supporting frame, a large am