Building wall connecting seat and building wall connecting seat mounting structure

The invention relates to a building component, in particular to a building wall connecting seat and a building wall connecting seat mounting structure which are convenient to disassemble and save time and labor. The building wall connecting seat comprises a connecting base, the interior of the connecting base is of a cavity structure, a vertically-arranged rotating shaft is arranged in the cavity of the connecting base, a transmission plate is arranged on the rotating shaft, a limiting column is arranged on one side of the rotating shaft, the top end of the limiting column is of a cone structure, the limiting column is connected with the connecting base through a spring, and a through hole matched with the limiting column is formed in the connecting base; and a limiting structure is arranged at the top end of the rotating shaft and used for avoiding rotation of the rotating shaft caused by spring-back of the limiting column due to spring-back of the spring. By rotating the rotating shaft, the transmission pla