The invention relates to the technical field of emergency flood fighting, in particular to a structure for repairing a buttress dam. The IPC class number of the structure for repairing the buttress dam is E02B 3/12. The structure for repairing the buttress dam comprises a heightened apron, crushed stone concrete, a seepage prevention wall, a concrete cover plate, a top geocell, new foundation soil, a boundary geocell, a lead wire net and filter pipes. The heightened apron is located on the upper portion of an original apron, the crushed stone concrete is located at the bonding part of the original apron and original foundation soil, the seepage prevention wall is located on the soil-stone bonding part of the heightened apron and the new foundation soil and the soil-stone bonding part of the heightened apron and the original foundation soil, and the top geocell is arranged on the top of the new foundation soil. According to the structure for repairing the buttress dam, other large equipment does not need to be invoked in construction, and the first-line flood fighting team can carry out construction rapidly only through standing flood fighting materials.