The utility model provides an automatic fillet welding machine, include: welding machine body, and the one end of welding machine body is provided with a support, and the both sides of support respectively are provided with a welder and one and dry by the fire the rifle, toast in step and weld. The utility model provides a pair of automatic weld machine, with welder with dry by the fire the rifleintegration and set up on the welding machine body, when carrying out the steel sheet welding, the synchronous realization is toasted and is welded to reducing the production of gas pocket, in addition, will drying by the fire the rifle and install on the welding machine body, its structure and function that does not influence original fillet welding machine realizes the utility model discloses the pluralism of automatic weld machine function.