Industrial welding robot

The invention relates to an industrial welding robot. The industrial welding robot comprises a base. Four mounting holes are symmetrically formed in the base. A transmission shaft is mounted in the middle of the upper end face of the base through a bearing. A transmission gear is mounted in the middle of the transmission shaft. The outer wall of the transmission gear is evenly engaged with four transmission branch chains in the axis direction. A rotary disc is welded to the upper end of the transmission shaft. Fixing columns are symmetrically mounted on the upper end face of the base. A limiting disc is mounted on the upper end faces of the four fixing columns. Limiting concave portions are evenly arranged on the upper end face of the limiting disc in the axis direction. A limiting and locking mechanism is mounted at the upper end of the rotary disc. The tail end of the limiting and locking mechanism corresponds to the corresponding limiting concave portions on the limiting disc. Four supporting columns are s