The invention provides a novel external wall fixing unit with the simple structure. The novel external wall fixing unit comprises a connector body; the connector body comprises a hollow shell, a rotating shaft which is accommodated in the hollow shell and can rotate relative to the hollow shell, fixing blocks mounted on the hollow shell and used for jointly fixing and holding external wall parts with the rotating shaft, and a detachable connecting device used for fixing the fixing blocks to the hollow shell; and the hollow shell comprises a lower shell, an upper shell and protruding blocks extending out of the two sides of the lower shell. The novel external wall fixing unit can adapt to the needs of an external wall of an irregular building, the stress of the external wall can be reduced,the external wall is effectively protected, and the novel external wall fixing unit is simple in structure, convenient, fast and efficient in mounting, and low in manufacturing and mounting cost.