Method for repairing and reinforcing old building of ganged brick outer wall

The invention relates to the technical field of building repairing, and discloses a ganged brick outer wall old building repairing and reinforcing method which comprises the following steps: S1, repairing a ganged brick outer wall of an old building; s2, a partition wall of an old building roof is dismantled; s3, a buttress structure system is built, and the outer wall in the step S1 is supported; s4, the connecting component is dismantled, and the empty hopper part is blocked through ganged bricks; s5, the rubble foundation of the old building is protected and reinforced; s6, the roof and the indoor structure are rebuilt, a rebuilt foundation adopts a raft foundation and is connected with a rubble foundation, and a rebuilt frame structure is tied to an outer wall; and S7, the buttress structure system is dismantled. A ganged brick outer wall is reserved to serve as an outer skin, a buttress structure system is adopted to support the outer wall during rebuilding, a raft foundation with high integrity is adopt