Tower crane cargo boom self-unloading device

The utility model discloses a tower crane cargo boom self-unloading device which comprises a lifting derrick mast, a rotating part is installed at the bottom end of the lifting derrick mast, movable bases are installed at the bottom end of the rotating part, the movable bases are installed on the two sides of a cargo boom section, adjusting rotating handles are installed in the movable bases, and the adjusting rotating handles are connected with the lifting derrick mast. A clamping piece a is installed in the movable base and connected with an adjusting rotating handle, a clamping piece b is installed in the movable base and connected with the adjusting rotating handle, and pulleys are installed at the upper end and the lower end in the movable base. By arranging the movable base, the self-unloading device can be moved by utilizing the pulley arranged in the movable base, so that the position of the lifting derrick mast on the lifting arm section is adjusted, the clamping piece a and the clamping piece b are