The utility model relates to a curtain wall skeleton, which comprises upright posts and crossbeams; each upright post comprises a main body part and a projected part formed on the front end of the main body part; wherein, the transverse size of the projected part is less than the transverse size of the main body part; the crossbeam is firmly assembled on the projected part by fasteners. Since the crossbeam is fixed on the smaller-sized projected part of the upright post by the fasteners, the end of the crossbeam only needs to be cut flat, therefore the processing load of the crossbeam and the usage of crossbeam material are reduced, and moreover, the curtain wall skeleton has the advantages of simple structure, simple processing, low total construction cost, etc.