Gantry crane danger warning device

The utility model discloses a gantry crane danger warning device. The gantry crane danger warning device comprises a projection part used for carrying out projection warning on the ground and an installation part used for installing the projection part on a suspension arm of a gantry crane. The mounting part comprises a honeycomb plate used for being attached to the gantry crane suspension arm, aside extending plate is fixedly mounted on the honeycomb plate, a balance plate is hinged to the end, away from the honeycomb plate, of the side extending plate, a top groove is formed in the bottom of the side extending plate, and a plurality of electromagnets used for attracting the gantry crane suspension arm are further mounted on the honeycomb plate; the projection part comprises a cassette fixedly mounted at the bottom end of the balance plate; the LED lamp groups are arranged in the cassette and have a certain arrangement sequence; the LED lamp set is installed in the dark box, warningprojection is formed on th