Construction method for adding earthquake-proof layer to brick concrete building

The invention relates to a construction method for adding an earthquake-proof layer to a brick concrete building. The construction method can effectively solve the problem that the house brick concrete building is collapsed due to an earthquake. The method comprises the steps that an indoor floor is broken and removed; indoor and outdoor trenches are excavated; an outdoor retaining wall is laid; pin key holes are punched in a foundation wall; a formwork is arranged in a lower plane of the pin key holes in a supporting manner; pin key steel and lower bracket beam steel are mounted; a lower bracket beam side formwork is arranged in a supporting manner; an earthquake-proof bearing is mounted; grouting is conducted; lower bracket beam concrete is poured; an inner upper bracket beam bottom formwork and an outer upper bracket beam bottom formwork of the foundation wall are arranged in a supporting manner; the pin key steel and upper bracket beam steel are mounted; an outdoor upper bracket beam side formwork and a c