Tower crane sheet type standard knot automatic welding tool

The utility model relates to the technical field of tower crane sheet type standard section welding, and discloses a tower crane sheet type standard section automatic welding tool which comprises a welding platform. The two single limb positioning devices are arranged at the two ends of the single limb; three web member positioning devices; and two pore plate positioning devices. The two-hole-plate positioning device comprises a positioning base plate, a second telescopic component, two positioning pins and a second pressing assembly, wherein the second telescopic component is installed on the welding platform and can stretch out and draw back in the width direction of the single limb, the free end of the second telescopic component is fixedly connected with the positioning base plate, and the two positioning pins and the second pressing assembly are arranged on the positioning base plate. The first positioning holes are tensioned through cooperation of the pull rod and the elastic tensioning sleeve, position