The invention discloses an FGB method efficient submerged-arc welding mating welding material. Sintered flux comprises raw materials, by weight, 25-35 parts of MgO, 2-6 parts of CaO, 10-20 parts of CaF2, 15-25 parts of Al2O3, 15-25 parts of SiO2, 0-2 parts of K2O, 0-4 parts of Na2O and 0-1 part of CeO; alloy powder comprises raw materials, by weight, 95-100 parts of Fe, 0-4 parts of Mn, 0-1 part of TiFe, 0-1 part of SiFe, 0-0.5 part of Ni and 0-0.5 part of Mo; and a ceramic liner comprises raw materials, by weight, 40-60 parts of Al2O3, 4-8 parts of MgO, 30-40 parts of SiO2 and 2-8 parts of K2O. According to the mating welding material, special raw materials are used, reasonable matching is achieved, the FGB method process welding requirement can be met, the mechanical property can achieve the 4Y-stage level, and the good process performance is achieved.