The invention belongs to the technical field of ancient building repair construction, and relates to an ancient building outer wall repair process which at least comprises the following steps of S1, outer wall state inspection, S2, working table top building and old wall
surface cleaning, S3,
performance comparison test on new and old wall bricks, S4, new
brick type selection, S5, material preparation, S6, leveling and paying off, S7, ash mixing, S8, new
brick masonry, S9, seam repairing, S10, seam
hooking and S11, protective
coating painting. According to the technology, in the
brick selecting link, through detection of the flexural and
compressive strength of the bricks and calculation of discreteness and the like, the bricks are strictly tested and screened, the repaired outer wall is high in strength and good in bearing performance, the technology almost has no damage to the original outer wall, the original state of the ancient building can be restored to the maximum extent, and the materials and the like can be close to those of the original wall surface; the consistency of the appearance of the ancient building bare brick wall built by the new bricks and the original appearance of the wall body is improved, and the ancient building repair concept of'repairing old as before 'is fully met.