Welding clamp tool for antenna support extension arm of communication iron tower

The invention belongs to the field of communication iron tower accessory machining, and particularly relates to a communication iron tower antenna support extension arm welding clamp tool which comprises a bottom supporting mechanism, a fixed clamping assembly and a movable clamping assembly, the bottom supporting mechanism is used for supporting a sectional material, and the fixed end clamping assembly comprises a first two-shaft self-positioning hydraulic chuck; the first two-shaft self-positioning hydraulic chuck is used for clamping a first side plate, and the movable clamping assembly comprises a second two-shaft self-positioning hydraulic chuck, a guide rail and a movable driver. The bottom supporting mechanism, the fixed clamping assembly and the movable clamping assembly are arranged, center positioning and automatic clamping can be achieved, spot welding and welding only need one-time clamping, the tool can be suitable for extending arms with different side plate sizes and different sectional materia