The utility model is applicable to the field of welding technology, and provides a wall-mounted automatic submerged arc horizontal position welding device, which comprises a power supply system, a welding device body system for welding automatically, and a control system for controlling the welding device body system to weld. The welding device body system comprises a frame rack, a traveling power device, a guide rail on which the frame rack slides, a wire feeding mechanism for conveying welding wires and a welding gun, wherein the guide rail is fixedly arranged on the wall of a workpiece to be welded, the traveling power device, the wire feeding mechanism and the welding gun are fixedly arranged on the frame rack. According to the wall-mounted automatic submerged arc horizontal position welding device, the submerged arc horizontal position welding and automation of the same are achieved, the welding quality and stability are improved, and the uniformity of welding is ensured; in addition, the automatic welding technique reduced requirements on operation technique of workers, modifies the work environment of the workers, and improves the production efficiency.