Fire-fighting design method and device for building wall

The invention relates to the field of building fire-fighting design, and discloses a fire-fighting design method of a building wall, which comprises the following steps of: after simulating a fire behavior on a thermal insulation layer through a fire behavior simulation component and starting a fire-fighting fire-extinguishing component on the thermal insulation layer for a preset time period, closing the fire behavior simulation component and the fire-fighting fire-extinguishing component, and shooting an image of the thermal insulation layer after a fire-fighting experiment; the heat preservation layer comprises a plurality of heat preservation plates of the same specification. The fire behavior simulation assembly is arranged along the edge of one insulation board and is used for forming a linear fire source; the fire extinguishing assembly comprises a heat preservation layer water pipe. The method comprises the following steps: determining a fire passing area on an image of a thermal insulation layer afte