Corn harvesting machinery automation robot mig welding includes welding robot body, robot mounting base, single-axis pneumatic positioner, welding fixture (designed and manufactured for customer workpieces), robot control system, robot teaching pendant, welding power supply, robot-specific welding gun, and external control box. Simple configuration, flexible layout, double-station configuration, flip positioner and fixture, stabilize and improve welding quality, and better ensure high-quality welding.