The present invention relates to a case of a boiler, and more particularly, to a method of joining a boiler case to prevent displacement of the panel during assembly of the case and minimizing deformation, and to a boiler case thereof. In the method; A plurality of separated panels are joined to each corner overlapping the adjacent panels by screws or rivets, and then each overlapping edge is attached by welding.;As a result, the position of each panel in the welding machine during the assembly operation of the boiler case is not only minimized, and defective products are minimized. In addition, the efficiency of the work can be increased and the boiler case of more uniform quality can be produced. Have.;Boiler, case, assembly, welding
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