The utility model is applicable to the technical field of welding and provides a guiding device for an automatic submerged arc horizontal position welding device. The device comprises a rotary loop bar, a laser gun and a laser gun fixing shaft. A through hole is formed in the rotary loop bar along the radial direction, the rotary loop bar is sleeved on a welding gun through the through hole, the laser gun fixing shaft is installed on the rotary loop bar in a rotatable mode along the axial direction of the rotary loop bar, and the laser gun penetrates the laser gun fixing shaft. By arranging the guiding device on the welding gun, the strafing direction of laser beam emitted by the laser gun can be kept parallel to the welding line forming direction by adjusting the angle of the welding gun, so that the welding gun can operate along the positions required by welding line forming, and linear forming of the welding line is guaranteed.