Automatic welding device of carbon dioxide protection welding machine

The utility model provides an automatic welding device of a carbon dioxide protection welding machine. The base is provided with a mounting surface; two groups of fixing assemblies; the two fixing assemblies are installed on the installation face in the first direction. The two groups of fixing assemblies are respectively used for fixing two square pipes to be welded; the fixing assembly comprises a fixing block; the fixing block is provided with a rectangular groove allowing the end of the square tube to be inserted therein. A fastener for fixing the square tube is arranged on the groove wall of the rectangular groove; a carbon dioxide protection welding machine body; the carbon dioxide protection welding machine body is installed on the installation face and located on one side of the two fixing assemblies. And the carbon dioxide protection welding machine body is used for welding the two square pipes. According to the square pipe welding device, the to-be-welded square pipes can be positioned and fixed, an