To provide a repairing method for an exterior wall, simply repairing an exterior wall without complicated work.

This repairing method for an exterior wall is characterized in that a liquid organic polymer having viscosity of 10,000 mPa s or less is applied to a joint formed between tiles of the exterior wall subjected to tiling or a sealing material of the exterior wall. Thus, a coating film of an organic polymer is formed and put on the surface of the organic material such as the sealing material or an adhesive exposed from the joint to improve the strength and design nature of the exterior wall only by the work of applying the organic polymer on the joint or the sealing material, so that the exterior wall can be used continuously over a long period of time in the future.